Thu, 12 Jul 2012 14:26:25 -0400
Merge
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 "services/memTracker.hpp"
39 #include "utilities/defaultStream.hpp"
40 #include "utilities/taskqueue.hpp"
41 #ifdef TARGET_OS_FAMILY_linux
42 # include "os_linux.inline.hpp"
43 #endif
44 #ifdef TARGET_OS_FAMILY_solaris
45 # include "os_solaris.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_windows
48 # include "os_windows.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_bsd
51 # include "os_bsd.inline.hpp"
52 #endif
53 #ifndef SERIALGC
54 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
55 #endif
57 // Note: This is a special bug reporting site for the JVM
58 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
59 #define DEFAULT_JAVA_LAUNCHER "generic"
61 char** Arguments::_jvm_flags_array = NULL;
62 int Arguments::_num_jvm_flags = 0;
63 char** Arguments::_jvm_args_array = NULL;
64 int Arguments::_num_jvm_args = 0;
65 char* Arguments::_java_command = NULL;
66 SystemProperty* Arguments::_system_properties = NULL;
67 const char* Arguments::_gc_log_filename = NULL;
68 bool Arguments::_has_profile = false;
69 bool Arguments::_has_alloc_profile = false;
70 uintx Arguments::_min_heap_size = 0;
71 Arguments::Mode Arguments::_mode = _mixed;
72 bool Arguments::_java_compiler = false;
73 bool Arguments::_xdebug_mode = false;
74 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
75 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
76 int Arguments::_sun_java_launcher_pid = -1;
77 bool Arguments::_created_by_gamma_launcher = false;
79 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
80 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
81 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
82 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
83 bool Arguments::_ClipInlining = ClipInlining;
85 char* Arguments::SharedArchivePath = NULL;
87 AgentLibraryList Arguments::_libraryList;
88 AgentLibraryList Arguments::_agentList;
90 abort_hook_t Arguments::_abort_hook = NULL;
91 exit_hook_t Arguments::_exit_hook = NULL;
92 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
95 SystemProperty *Arguments::_java_ext_dirs = NULL;
96 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
97 SystemProperty *Arguments::_sun_boot_library_path = NULL;
98 SystemProperty *Arguments::_java_library_path = NULL;
99 SystemProperty *Arguments::_java_home = NULL;
100 SystemProperty *Arguments::_java_class_path = NULL;
101 SystemProperty *Arguments::_sun_boot_class_path = NULL;
103 char* Arguments::_meta_index_path = NULL;
104 char* Arguments::_meta_index_dir = NULL;
106 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
108 static bool match_option(const JavaVMOption *option, const char* name,
109 const char** tail) {
110 int len = (int)strlen(name);
111 if (strncmp(option->optionString, name, len) == 0) {
112 *tail = option->optionString + len;
113 return true;
114 } else {
115 return false;
116 }
117 }
119 static void logOption(const char* opt) {
120 if (PrintVMOptions) {
121 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
122 }
123 }
125 // Process java launcher properties.
126 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
127 // See if sun.java.launcher or sun.java.launcher.pid is defined.
128 // Must do this before setting up other system properties,
129 // as some of them may depend on launcher type.
130 for (int index = 0; index < args->nOptions; index++) {
131 const JavaVMOption* option = args->options + index;
132 const char* tail;
134 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
135 process_java_launcher_argument(tail, option->extraInfo);
136 continue;
137 }
138 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
139 _sun_java_launcher_pid = atoi(tail);
140 continue;
141 }
142 }
143 }
145 // Initialize system properties key and value.
146 void Arguments::init_system_properties() {
148 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
149 "Java Virtual Machine Specification", false));
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
154 // following are JVMTI agent writeable properties.
155 // Properties values are set to NULL and they are
156 // os specific they are initialized in os::init_system_properties_values().
157 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
158 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
159 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
160 _java_library_path = new SystemProperty("java.library.path", NULL, true);
161 _java_home = new SystemProperty("java.home", NULL, true);
162 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
164 _java_class_path = new SystemProperty("java.class.path", "", true);
166 // Add to System Property list.
167 PropertyList_add(&_system_properties, _java_ext_dirs);
168 PropertyList_add(&_system_properties, _java_endorsed_dirs);
169 PropertyList_add(&_system_properties, _sun_boot_library_path);
170 PropertyList_add(&_system_properties, _java_library_path);
171 PropertyList_add(&_system_properties, _java_home);
172 PropertyList_add(&_system_properties, _java_class_path);
173 PropertyList_add(&_system_properties, _sun_boot_class_path);
175 // Set OS specific system properties values
176 os::init_system_properties_values();
177 }
180 // Update/Initialize System properties after JDK version number is known
181 void Arguments::init_version_specific_system_properties() {
182 enum { bufsz = 16 };
183 char buffer[bufsz];
184 const char* spec_vendor = "Sun Microsystems Inc.";
185 uint32_t spec_version = 0;
187 if (JDK_Version::is_gte_jdk17x_version()) {
188 spec_vendor = "Oracle Corporation";
189 spec_version = JDK_Version::current().major_version();
190 }
191 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
193 PropertyList_add(&_system_properties,
194 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
195 PropertyList_add(&_system_properties,
196 new SystemProperty("java.vm.specification.version", buffer, false));
197 PropertyList_add(&_system_properties,
198 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
199 }
201 /**
202 * Provide a slightly more user-friendly way of eliminating -XX flags.
203 * When a flag is eliminated, it can be added to this list in order to
204 * continue accepting this flag on the command-line, while issuing a warning
205 * and ignoring the value. Once the JDK version reaches the 'accept_until'
206 * limit, we flatly refuse to admit the existence of the flag. This allows
207 * a flag to die correctly over JDK releases using HSX.
208 */
209 typedef struct {
210 const char* name;
211 JDK_Version obsoleted_in; // when the flag went away
212 JDK_Version accept_until; // which version to start denying the existence
213 } ObsoleteFlag;
215 static ObsoleteFlag obsolete_jvm_flags[] = {
216 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
217 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
230 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
231 { "DefaultInitialRAMFraction",
232 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "UseDepthFirstScavengeOrder",
234 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
235 { "HandlePromotionFailure",
236 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
237 { "MaxLiveObjectEvacuationRatio",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
240 { "UseParallelOldGCCompacting",
241 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
242 { "UseParallelDensePrefixUpdate",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelOldGCDensePrefix",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
247 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 #ifdef PRODUCT
249 { "DesiredMethodLimit",
250 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
251 #endif // PRODUCT
252 { NULL, JDK_Version(0), JDK_Version(0) }
253 };
255 // Returns true if the flag is obsolete and fits into the range specified
256 // for being ignored. In the case that the flag is ignored, the 'version'
257 // value is filled in with the version number when the flag became
258 // obsolete so that that value can be displayed to the user.
259 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
260 int i = 0;
261 assert(version != NULL, "Must provide a version buffer");
262 while (obsolete_jvm_flags[i].name != NULL) {
263 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
264 // <flag>=xxx form
265 // [-|+]<flag> form
266 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
267 ((s[0] == '+' || s[0] == '-') &&
268 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
269 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
270 *version = flag_status.obsoleted_in;
271 return true;
272 }
273 }
274 i++;
275 }
276 return false;
277 }
279 // Constructs the system class path (aka boot class path) from the following
280 // components, in order:
281 //
282 // prefix // from -Xbootclasspath/p:...
283 // endorsed // the expansion of -Djava.endorsed.dirs=...
284 // base // from os::get_system_properties() or -Xbootclasspath=
285 // suffix // from -Xbootclasspath/a:...
286 //
287 // java.endorsed.dirs is a list of directories; any jar or zip files in the
288 // directories are added to the sysclasspath just before the base.
289 //
290 // This could be AllStatic, but it isn't needed after argument processing is
291 // complete.
292 class SysClassPath: public StackObj {
293 public:
294 SysClassPath(const char* base);
295 ~SysClassPath();
297 inline void set_base(const char* base);
298 inline void add_prefix(const char* prefix);
299 inline void add_suffix_to_prefix(const char* suffix);
300 inline void add_suffix(const char* suffix);
301 inline void reset_path(const char* base);
303 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
304 // property. Must be called after all command-line arguments have been
305 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
306 // combined_path().
307 void expand_endorsed();
309 inline const char* get_base() const { return _items[_scp_base]; }
310 inline const char* get_prefix() const { return _items[_scp_prefix]; }
311 inline const char* get_suffix() const { return _items[_scp_suffix]; }
312 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
314 // Combine all the components into a single c-heap-allocated string; caller
315 // must free the string if/when no longer needed.
316 char* combined_path();
318 private:
319 // Utility routines.
320 static char* add_to_path(const char* path, const char* str, bool prepend);
321 static char* add_jars_to_path(char* path, const char* directory);
323 inline void reset_item_at(int index);
325 // Array indices for the items that make up the sysclasspath. All except the
326 // base are allocated in the C heap and freed by this class.
327 enum {
328 _scp_prefix, // from -Xbootclasspath/p:...
329 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
330 _scp_base, // the default sysclasspath
331 _scp_suffix, // from -Xbootclasspath/a:...
332 _scp_nitems // the number of items, must be last.
333 };
335 const char* _items[_scp_nitems];
336 DEBUG_ONLY(bool _expansion_done;)
337 };
339 SysClassPath::SysClassPath(const char* base) {
340 memset(_items, 0, sizeof(_items));
341 _items[_scp_base] = base;
342 DEBUG_ONLY(_expansion_done = false;)
343 }
345 SysClassPath::~SysClassPath() {
346 // Free everything except the base.
347 for (int i = 0; i < _scp_nitems; ++i) {
348 if (i != _scp_base) reset_item_at(i);
349 }
350 DEBUG_ONLY(_expansion_done = false;)
351 }
353 inline void SysClassPath::set_base(const char* base) {
354 _items[_scp_base] = base;
355 }
357 inline void SysClassPath::add_prefix(const char* prefix) {
358 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
359 }
361 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
362 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
363 }
365 inline void SysClassPath::add_suffix(const char* suffix) {
366 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
367 }
369 inline void SysClassPath::reset_item_at(int index) {
370 assert(index < _scp_nitems && index != _scp_base, "just checking");
371 if (_items[index] != NULL) {
372 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
373 _items[index] = NULL;
374 }
375 }
377 inline void SysClassPath::reset_path(const char* base) {
378 // Clear the prefix and suffix.
379 reset_item_at(_scp_prefix);
380 reset_item_at(_scp_suffix);
381 set_base(base);
382 }
384 //------------------------------------------------------------------------------
386 void SysClassPath::expand_endorsed() {
387 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
389 const char* path = Arguments::get_property("java.endorsed.dirs");
390 if (path == NULL) {
391 path = Arguments::get_endorsed_dir();
392 assert(path != NULL, "no default for java.endorsed.dirs");
393 }
395 char* expanded_path = NULL;
396 const char separator = *os::path_separator();
397 const char* const end = path + strlen(path);
398 while (path < end) {
399 const char* tmp_end = strchr(path, separator);
400 if (tmp_end == NULL) {
401 expanded_path = add_jars_to_path(expanded_path, path);
402 path = end;
403 } else {
404 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
405 memcpy(dirpath, path, tmp_end - path);
406 dirpath[tmp_end - path] = '\0';
407 expanded_path = add_jars_to_path(expanded_path, dirpath);
408 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
409 path = tmp_end + 1;
410 }
411 }
412 _items[_scp_endorsed] = expanded_path;
413 DEBUG_ONLY(_expansion_done = true;)
414 }
416 // Combine the bootclasspath elements, some of which may be null, into a single
417 // c-heap-allocated string.
418 char* SysClassPath::combined_path() {
419 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
420 assert(_expansion_done, "must call expand_endorsed() first.");
422 size_t lengths[_scp_nitems];
423 size_t total_len = 0;
425 const char separator = *os::path_separator();
427 // Get the lengths.
428 int i;
429 for (i = 0; i < _scp_nitems; ++i) {
430 if (_items[i] != NULL) {
431 lengths[i] = strlen(_items[i]);
432 // Include space for the separator char (or a NULL for the last item).
433 total_len += lengths[i] + 1;
434 }
435 }
436 assert(total_len > 0, "empty sysclasspath not allowed");
438 // Copy the _items to a single string.
439 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
440 char* cp_tmp = cp;
441 for (i = 0; i < _scp_nitems; ++i) {
442 if (_items[i] != NULL) {
443 memcpy(cp_tmp, _items[i], lengths[i]);
444 cp_tmp += lengths[i];
445 *cp_tmp++ = separator;
446 }
447 }
448 *--cp_tmp = '\0'; // Replace the extra separator.
449 return cp;
450 }
452 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
453 char*
454 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
455 char *cp;
457 assert(str != NULL, "just checking");
458 if (path == NULL) {
459 size_t len = strlen(str) + 1;
460 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
461 memcpy(cp, str, len); // copy the trailing null
462 } else {
463 const char separator = *os::path_separator();
464 size_t old_len = strlen(path);
465 size_t str_len = strlen(str);
466 size_t len = old_len + str_len + 2;
468 if (prepend) {
469 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
470 char* cp_tmp = cp;
471 memcpy(cp_tmp, str, str_len);
472 cp_tmp += str_len;
473 *cp_tmp = separator;
474 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
475 FREE_C_HEAP_ARRAY(char, path, mtInternal);
476 } else {
477 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
478 char* cp_tmp = cp + old_len;
479 *cp_tmp = separator;
480 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
481 }
482 }
483 return cp;
484 }
486 // Scan the directory and append any jar or zip files found to path.
487 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
488 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
489 DIR* dir = os::opendir(directory);
490 if (dir == NULL) return path;
492 char dir_sep[2] = { '\0', '\0' };
493 size_t directory_len = strlen(directory);
494 const char fileSep = *os::file_separator();
495 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
497 /* Scan the directory for jars/zips, appending them to path. */
498 struct dirent *entry;
499 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
500 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
501 const char* name = entry->d_name;
502 const char* ext = name + strlen(name) - 4;
503 bool isJarOrZip = ext > name &&
504 (os::file_name_strcmp(ext, ".jar") == 0 ||
505 os::file_name_strcmp(ext, ".zip") == 0);
506 if (isJarOrZip) {
507 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
508 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
509 path = add_to_path(path, jarpath, false);
510 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
511 }
512 }
513 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
514 os::closedir(dir);
515 return path;
516 }
518 // Parses a memory size specification string.
519 static bool atomull(const char *s, julong* result) {
520 julong n = 0;
521 int args_read = sscanf(s, os::julong_format_specifier(), &n);
522 if (args_read != 1) {
523 return false;
524 }
525 while (*s != '\0' && isdigit(*s)) {
526 s++;
527 }
528 // 4705540: illegal if more characters are found after the first non-digit
529 if (strlen(s) > 1) {
530 return false;
531 }
532 switch (*s) {
533 case 'T': case 't':
534 *result = n * G * K;
535 // Check for overflow.
536 if (*result/((julong)G * K) != n) return false;
537 return true;
538 case 'G': case 'g':
539 *result = n * G;
540 if (*result/G != n) return false;
541 return true;
542 case 'M': case 'm':
543 *result = n * M;
544 if (*result/M != n) return false;
545 return true;
546 case 'K': case 'k':
547 *result = n * K;
548 if (*result/K != n) return false;
549 return true;
550 case '\0':
551 *result = n;
552 return true;
553 default:
554 return false;
555 }
556 }
558 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
559 if (size < min_size) return arg_too_small;
560 // Check that size will fit in a size_t (only relevant on 32-bit)
561 if (size > max_uintx) return arg_too_big;
562 return arg_in_range;
563 }
565 // Describe an argument out of range error
566 void Arguments::describe_range_error(ArgsRange errcode) {
567 switch(errcode) {
568 case arg_too_big:
569 jio_fprintf(defaultStream::error_stream(),
570 "The specified size exceeds the maximum "
571 "representable size.\n");
572 break;
573 case arg_too_small:
574 case arg_unreadable:
575 case arg_in_range:
576 // do nothing for now
577 break;
578 default:
579 ShouldNotReachHere();
580 }
581 }
583 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
584 return CommandLineFlags::boolAtPut(name, &value, origin);
585 }
587 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
588 double v;
589 if (sscanf(value, "%lf", &v) != 1) {
590 return false;
591 }
593 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
594 return true;
595 }
596 return false;
597 }
599 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
600 julong v;
601 intx intx_v;
602 bool is_neg = false;
603 // Check the sign first since atomull() parses only unsigned values.
604 if (*value == '-') {
605 if (!CommandLineFlags::intxAt(name, &intx_v)) {
606 return false;
607 }
608 value++;
609 is_neg = true;
610 }
611 if (!atomull(value, &v)) {
612 return false;
613 }
614 intx_v = (intx) v;
615 if (is_neg) {
616 intx_v = -intx_v;
617 }
618 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
619 return true;
620 }
621 uintx uintx_v = (uintx) v;
622 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
623 return true;
624 }
625 uint64_t uint64_t_v = (uint64_t) v;
626 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
627 return true;
628 }
629 return false;
630 }
632 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
633 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
634 // Contract: CommandLineFlags always returns a pointer that needs freeing.
635 FREE_C_HEAP_ARRAY(char, value, mtInternal);
636 return true;
637 }
639 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
640 const char* old_value = "";
641 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
642 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
643 size_t new_len = strlen(new_value);
644 const char* value;
645 char* free_this_too = NULL;
646 if (old_len == 0) {
647 value = new_value;
648 } else if (new_len == 0) {
649 value = old_value;
650 } else {
651 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
652 // each new setting adds another LINE to the switch:
653 sprintf(buf, "%s\n%s", old_value, new_value);
654 value = buf;
655 free_this_too = buf;
656 }
657 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
658 // CommandLineFlags always returns a pointer that needs freeing.
659 FREE_C_HEAP_ARRAY(char, value, mtInternal);
660 if (free_this_too != NULL) {
661 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
662 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
663 }
664 return true;
665 }
667 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
669 // range of acceptable characters spelled out for portability reasons
670 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
671 #define BUFLEN 255
672 char name[BUFLEN+1];
673 char dummy;
675 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
676 return set_bool_flag(name, false, origin);
677 }
678 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
679 return set_bool_flag(name, true, origin);
680 }
682 char punct;
683 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
684 const char* value = strchr(arg, '=') + 1;
685 Flag* flag = Flag::find_flag(name, strlen(name));
686 if (flag != NULL && flag->is_ccstr()) {
687 if (flag->ccstr_accumulates()) {
688 return append_to_string_flag(name, value, origin);
689 } else {
690 if (value[0] == '\0') {
691 value = NULL;
692 }
693 return set_string_flag(name, value, origin);
694 }
695 }
696 }
698 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
699 const char* value = strchr(arg, '=') + 1;
700 // -XX:Foo:=xxx will reset the string flag to the given value.
701 if (value[0] == '\0') {
702 value = NULL;
703 }
704 return set_string_flag(name, value, origin);
705 }
707 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
708 #define SIGNED_NUMBER_RANGE "[-0123456789]"
709 #define NUMBER_RANGE "[0123456789]"
710 char value[BUFLEN + 1];
711 char value2[BUFLEN + 1];
712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
713 // Looks like a floating-point number -- try again with more lenient format string
714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
715 return set_fp_numeric_flag(name, value, origin);
716 }
717 }
719 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
720 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
721 return set_numeric_flag(name, value, origin);
722 }
724 return false;
725 }
727 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
728 assert(bldarray != NULL, "illegal argument");
730 if (arg == NULL) {
731 return;
732 }
734 int index = *count;
736 // expand the array and add arg to the last element
737 (*count)++;
738 if (*bldarray == NULL) {
739 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
740 } else {
741 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
742 }
743 (*bldarray)[index] = strdup(arg);
744 }
746 void Arguments::build_jvm_args(const char* arg) {
747 add_string(&_jvm_args_array, &_num_jvm_args, arg);
748 }
750 void Arguments::build_jvm_flags(const char* arg) {
751 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
752 }
754 // utility function to return a string that concatenates all
755 // strings in a given char** array
756 const char* Arguments::build_resource_string(char** args, int count) {
757 if (args == NULL || count == 0) {
758 return NULL;
759 }
760 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
761 for (int i = 1; i < count; i++) {
762 length += strlen(args[i]) + 1; // add 1 for a space
763 }
764 char* s = NEW_RESOURCE_ARRAY(char, length);
765 strcpy(s, args[0]);
766 for (int j = 1; j < count; j++) {
767 strcat(s, " ");
768 strcat(s, args[j]);
769 }
770 return (const char*) s;
771 }
773 void Arguments::print_on(outputStream* st) {
774 st->print_cr("VM Arguments:");
775 if (num_jvm_flags() > 0) {
776 st->print("jvm_flags: "); print_jvm_flags_on(st);
777 }
778 if (num_jvm_args() > 0) {
779 st->print("jvm_args: "); print_jvm_args_on(st);
780 }
781 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
782 st->print_cr("Launcher Type: %s", _sun_java_launcher);
783 }
785 void Arguments::print_jvm_flags_on(outputStream* st) {
786 if (_num_jvm_flags > 0) {
787 for (int i=0; i < _num_jvm_flags; i++) {
788 st->print("%s ", _jvm_flags_array[i]);
789 }
790 st->print_cr("");
791 }
792 }
794 void Arguments::print_jvm_args_on(outputStream* st) {
795 if (_num_jvm_args > 0) {
796 for (int i=0; i < _num_jvm_args; i++) {
797 st->print("%s ", _jvm_args_array[i]);
798 }
799 st->print_cr("");
800 }
801 }
803 bool Arguments::process_argument(const char* arg,
804 jboolean ignore_unrecognized, FlagValueOrigin origin) {
806 JDK_Version since = JDK_Version();
808 if (parse_argument(arg, origin) || ignore_unrecognized) {
809 return true;
810 }
812 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
813 if (is_newly_obsolete(arg, &since)) {
814 char version[256];
815 since.to_string(version, sizeof(version));
816 warning("ignoring option %s; support was removed in %s", argname, version);
817 return true;
818 }
820 // For locked flags, report a custom error message if available.
821 // Otherwise, report the standard unrecognized VM option.
823 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
824 if (locked_flag != NULL) {
825 char locked_message_buf[BUFLEN];
826 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
827 if (strlen(locked_message_buf) == 0) {
828 jio_fprintf(defaultStream::error_stream(),
829 "Unrecognized VM option '%s'\n", argname);
830 } else {
831 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
832 }
833 } else {
834 jio_fprintf(defaultStream::error_stream(),
835 "Unrecognized VM option '%s'\n", argname);
836 }
838 // allow for commandline "commenting out" options like -XX:#+Verbose
839 return arg[0] == '#';
840 }
842 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
843 FILE* stream = fopen(file_name, "rb");
844 if (stream == NULL) {
845 if (should_exist) {
846 jio_fprintf(defaultStream::error_stream(),
847 "Could not open settings file %s\n", file_name);
848 return false;
849 } else {
850 return true;
851 }
852 }
854 char token[1024];
855 int pos = 0;
857 bool in_white_space = true;
858 bool in_comment = false;
859 bool in_quote = false;
860 char quote_c = 0;
861 bool result = true;
863 int c = getc(stream);
864 while(c != EOF) {
865 if (in_white_space) {
866 if (in_comment) {
867 if (c == '\n') in_comment = false;
868 } else {
869 if (c == '#') in_comment = true;
870 else if (!isspace(c)) {
871 in_white_space = false;
872 token[pos++] = c;
873 }
874 }
875 } else {
876 if (c == '\n' || (!in_quote && isspace(c))) {
877 // token ends at newline, or at unquoted whitespace
878 // this allows a way to include spaces in string-valued options
879 token[pos] = '\0';
880 logOption(token);
881 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
882 build_jvm_flags(token);
883 pos = 0;
884 in_white_space = true;
885 in_quote = false;
886 } else if (!in_quote && (c == '\'' || c == '"')) {
887 in_quote = true;
888 quote_c = c;
889 } else if (in_quote && (c == quote_c)) {
890 in_quote = false;
891 } else {
892 token[pos++] = c;
893 }
894 }
895 c = getc(stream);
896 }
897 if (pos > 0) {
898 token[pos] = '\0';
899 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
900 build_jvm_flags(token);
901 }
902 fclose(stream);
903 return result;
904 }
906 //=============================================================================================================
907 // Parsing of properties (-D)
909 const char* Arguments::get_property(const char* key) {
910 return PropertyList_get_value(system_properties(), key);
911 }
913 bool Arguments::add_property(const char* prop) {
914 const char* eq = strchr(prop, '=');
915 char* key;
916 // ns must be static--its address may be stored in a SystemProperty object.
917 const static char ns[1] = {0};
918 char* value = (char *)ns;
920 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
921 key = AllocateHeap(key_len + 1, mtInternal);
922 strncpy(key, prop, key_len);
923 key[key_len] = '\0';
925 if (eq != NULL) {
926 size_t value_len = strlen(prop) - key_len - 1;
927 value = AllocateHeap(value_len + 1, mtInternal);
928 strncpy(value, &prop[key_len + 1], value_len + 1);
929 }
931 if (strcmp(key, "java.compiler") == 0) {
932 process_java_compiler_argument(value);
933 FreeHeap(key);
934 if (eq != NULL) {
935 FreeHeap(value);
936 }
937 return true;
938 } else if (strcmp(key, "sun.java.command") == 0) {
939 _java_command = value;
941 // Record value in Arguments, but let it get passed to Java.
942 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
943 // launcher.pid property is private and is processed
944 // in process_sun_java_launcher_properties();
945 // the sun.java.launcher property is passed on to the java application
946 FreeHeap(key);
947 if (eq != NULL) {
948 FreeHeap(value);
949 }
950 return true;
951 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
952 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
953 // its value without going through the property list or making a Java call.
954 _java_vendor_url_bug = value;
955 } else if (strcmp(key, "sun.boot.library.path") == 0) {
956 PropertyList_unique_add(&_system_properties, key, value, true);
957 return true;
958 }
959 // Create new property and add at the end of the list
960 PropertyList_unique_add(&_system_properties, key, value);
961 return true;
962 }
964 //===========================================================================================================
965 // Setting int/mixed/comp mode flags
967 void Arguments::set_mode_flags(Mode mode) {
968 // Set up default values for all flags.
969 // If you add a flag to any of the branches below,
970 // add a default value for it here.
971 set_java_compiler(false);
972 _mode = mode;
974 // Ensure Agent_OnLoad has the correct initial values.
975 // This may not be the final mode; mode may change later in onload phase.
976 PropertyList_unique_add(&_system_properties, "java.vm.info",
977 (char*)VM_Version::vm_info_string(), false);
979 UseInterpreter = true;
980 UseCompiler = true;
981 UseLoopCounter = true;
983 #ifndef ZERO
984 // Turn these off for mixed and comp. Leave them on for Zero.
985 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
986 UseFastAccessorMethods = (mode == _int);
987 }
988 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
989 UseFastEmptyMethods = (mode == _int);
990 }
991 #endif
993 // Default values may be platform/compiler dependent -
994 // use the saved values
995 ClipInlining = Arguments::_ClipInlining;
996 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
997 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
998 BackgroundCompilation = Arguments::_BackgroundCompilation;
1000 // Change from defaults based on mode
1001 switch (mode) {
1002 default:
1003 ShouldNotReachHere();
1004 break;
1005 case _int:
1006 UseCompiler = false;
1007 UseLoopCounter = false;
1008 AlwaysCompileLoopMethods = false;
1009 UseOnStackReplacement = false;
1010 break;
1011 case _mixed:
1012 // same as default
1013 break;
1014 case _comp:
1015 UseInterpreter = false;
1016 BackgroundCompilation = false;
1017 ClipInlining = false;
1018 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1019 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1020 // compile a level 4 (C2) and then continue executing it.
1021 if (TieredCompilation) {
1022 Tier3InvokeNotifyFreqLog = 0;
1023 Tier4InvocationThreshold = 0;
1024 }
1025 break;
1026 }
1027 }
1029 // Conflict: required to use shared spaces (-Xshare:on), but
1030 // incompatible command line options were chosen.
1032 static void no_shared_spaces() {
1033 if (RequireSharedSpaces) {
1034 jio_fprintf(defaultStream::error_stream(),
1035 "Class data sharing is inconsistent with other specified options.\n");
1036 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1037 } else {
1038 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1039 }
1040 }
1042 void Arguments::set_tiered_flags() {
1043 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1044 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1045 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1046 }
1047 if (CompilationPolicyChoice < 2) {
1048 vm_exit_during_initialization(
1049 "Incompatible compilation policy selected", NULL);
1050 }
1051 // Increase the code cache size - tiered compiles a lot more.
1052 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1053 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1054 }
1055 }
1057 #ifndef KERNEL
1058 static void disable_adaptive_size_policy(const char* collector_name) {
1059 if (UseAdaptiveSizePolicy) {
1060 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1061 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1062 collector_name);
1063 }
1064 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1065 }
1066 }
1068 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1069 // if it's not explictly set or unset. If the user has chosen
1070 // UseParNewGC and not explicitly set ParallelGCThreads we
1071 // set it, unless this is a single cpu machine.
1072 void Arguments::set_parnew_gc_flags() {
1073 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1074 "control point invariant");
1075 assert(UseParNewGC, "Error");
1077 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1078 disable_adaptive_size_policy("UseParNewGC");
1080 if (ParallelGCThreads == 0) {
1081 FLAG_SET_DEFAULT(ParallelGCThreads,
1082 Abstract_VM_Version::parallel_worker_threads());
1083 if (ParallelGCThreads == 1) {
1084 FLAG_SET_DEFAULT(UseParNewGC, false);
1085 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1086 }
1087 }
1088 if (UseParNewGC) {
1089 // CDS doesn't work with ParNew yet
1090 no_shared_spaces();
1092 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1093 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1094 // we set them to 1024 and 1024.
1095 // See CR 6362902.
1096 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1097 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1098 }
1099 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1100 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1101 }
1103 // AlwaysTenure flag should make ParNew promote all at first collection.
1104 // See CR 6362902.
1105 if (AlwaysTenure) {
1106 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1107 }
1108 // When using compressed oops, we use local overflow stacks,
1109 // rather than using a global overflow list chained through
1110 // the klass word of the object's pre-image.
1111 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1112 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1113 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1114 }
1115 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1116 }
1117 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1118 }
1119 }
1121 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1122 // sparc/solaris for certain applications, but would gain from
1123 // further optimization and tuning efforts, and would almost
1124 // certainly gain from analysis of platform and environment.
1125 void Arguments::set_cms_and_parnew_gc_flags() {
1126 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1127 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1129 // If we are using CMS, we prefer to UseParNewGC,
1130 // unless explicitly forbidden.
1131 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1132 FLAG_SET_ERGO(bool, UseParNewGC, true);
1133 }
1135 // Turn off AdaptiveSizePolicy for CMS until it is complete.
1136 disable_adaptive_size_policy("UseConcMarkSweepGC");
1138 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1139 // as needed.
1140 if (UseParNewGC) {
1141 set_parnew_gc_flags();
1142 }
1144 // MaxHeapSize is aligned down in collectorPolicy
1145 size_t max_heap = align_size_down(MaxHeapSize,
1146 CardTableRS::ct_max_alignment_constraint());
1148 // Now make adjustments for CMS
1149 intx tenuring_default = (intx)6;
1150 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1152 // Preferred young gen size for "short" pauses:
1153 // upper bound depends on # of threads and NewRatio.
1154 const uintx parallel_gc_threads =
1155 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1156 const size_t preferred_max_new_size_unaligned =
1157 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1158 size_t preferred_max_new_size =
1159 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1161 // Unless explicitly requested otherwise, size young gen
1162 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1164 // If either MaxNewSize or NewRatio is set on the command line,
1165 // assume the user is trying to set the size of the young gen.
1166 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1168 // Set MaxNewSize to our calculated preferred_max_new_size unless
1169 // NewSize was set on the command line and it is larger than
1170 // preferred_max_new_size.
1171 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1172 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1173 } else {
1174 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1175 }
1176 if (PrintGCDetails && Verbose) {
1177 // Too early to use gclog_or_tty
1178 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1179 }
1181 // Code along this path potentially sets NewSize and OldSize
1183 assert(max_heap >= InitialHeapSize, "Error");
1184 assert(max_heap >= NewSize, "Error");
1186 if (PrintGCDetails && Verbose) {
1187 // Too early to use gclog_or_tty
1188 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1189 " initial_heap_size: " SIZE_FORMAT
1190 " max_heap: " SIZE_FORMAT,
1191 min_heap_size(), InitialHeapSize, max_heap);
1192 }
1193 size_t min_new = preferred_max_new_size;
1194 if (FLAG_IS_CMDLINE(NewSize)) {
1195 min_new = NewSize;
1196 }
1197 if (max_heap > min_new && min_heap_size() > min_new) {
1198 // Unless explicitly requested otherwise, make young gen
1199 // at least min_new, and at most preferred_max_new_size.
1200 if (FLAG_IS_DEFAULT(NewSize)) {
1201 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1202 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1203 if (PrintGCDetails && Verbose) {
1204 // Too early to use gclog_or_tty
1205 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1206 }
1207 }
1208 // Unless explicitly requested otherwise, size old gen
1209 // so it's NewRatio x of NewSize.
1210 if (FLAG_IS_DEFAULT(OldSize)) {
1211 if (max_heap > NewSize) {
1212 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1213 if (PrintGCDetails && Verbose) {
1214 // Too early to use gclog_or_tty
1215 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1216 }
1217 }
1218 }
1219 }
1220 }
1221 // Unless explicitly requested otherwise, definitely
1222 // promote all objects surviving "tenuring_default" scavenges.
1223 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1224 FLAG_IS_DEFAULT(SurvivorRatio)) {
1225 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1226 }
1227 // If we decided above (or user explicitly requested)
1228 // `promote all' (via MaxTenuringThreshold := 0),
1229 // prefer minuscule survivor spaces so as not to waste
1230 // space for (non-existent) survivors
1231 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1232 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1233 }
1234 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1235 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1236 // This is done in order to make ParNew+CMS configuration to work
1237 // with YoungPLABSize and OldPLABSize options.
1238 // See CR 6362902.
1239 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1240 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1241 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1242 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1243 // the value (either from the command line or ergonomics) of
1244 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1245 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1246 } else {
1247 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1248 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1249 // we'll let it to take precedence.
1250 jio_fprintf(defaultStream::error_stream(),
1251 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1252 " options are specified for the CMS collector."
1253 " CMSParPromoteBlocksToClaim will take precedence.\n");
1254 }
1255 }
1256 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1257 // OldPLAB sizing manually turned off: Use a larger default setting,
1258 // unless it was manually specified. This is because a too-low value
1259 // will slow down scavenges.
1260 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1261 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1262 }
1263 }
1264 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1265 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1266 // If either of the static initialization defaults have changed, note this
1267 // modification.
1268 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1269 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1270 }
1271 if (PrintGCDetails && Verbose) {
1272 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1273 MarkStackSize / K, MarkStackSizeMax / K);
1274 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1275 }
1276 }
1277 #endif // KERNEL
1279 void set_object_alignment() {
1280 // Object alignment.
1281 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1282 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1283 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1284 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1285 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1286 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1288 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1289 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1291 // Oop encoding heap max
1292 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1294 #ifndef KERNEL
1295 // Set CMS global values
1296 CompactibleFreeListSpace::set_cms_values();
1297 #endif // KERNEL
1298 }
1300 bool verify_object_alignment() {
1301 // Object alignment.
1302 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1303 jio_fprintf(defaultStream::error_stream(),
1304 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1305 (int)ObjectAlignmentInBytes);
1306 return false;
1307 }
1308 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1309 jio_fprintf(defaultStream::error_stream(),
1310 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1311 (int)ObjectAlignmentInBytes, BytesPerLong);
1312 return false;
1313 }
1314 // It does not make sense to have big object alignment
1315 // since a space lost due to alignment will be greater
1316 // then a saved space from compressed oops.
1317 if ((int)ObjectAlignmentInBytes > 256) {
1318 jio_fprintf(defaultStream::error_stream(),
1319 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1320 (int)ObjectAlignmentInBytes);
1321 return false;
1322 }
1323 // In case page size is very small.
1324 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1325 jio_fprintf(defaultStream::error_stream(),
1326 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1327 (int)ObjectAlignmentInBytes, os::vm_page_size());
1328 return false;
1329 }
1330 return true;
1331 }
1333 inline uintx max_heap_for_compressed_oops() {
1334 // Avoid sign flip.
1335 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1336 return 0;
1337 }
1338 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1339 NOT_LP64(ShouldNotReachHere(); return 0);
1340 }
1342 bool Arguments::should_auto_select_low_pause_collector() {
1343 if (UseAutoGCSelectPolicy &&
1344 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1345 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1346 if (PrintGCDetails) {
1347 // Cannot use gclog_or_tty yet.
1348 tty->print_cr("Automatic selection of the low pause collector"
1349 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1350 }
1351 return true;
1352 }
1353 return false;
1354 }
1356 void Arguments::set_ergonomics_flags() {
1357 // Parallel GC is not compatible with sharing. If one specifies
1358 // that they want sharing explicitly, do not set ergonomics flags.
1359 if (DumpSharedSpaces || RequireSharedSpaces) {
1360 return;
1361 }
1363 if (os::is_server_class_machine()) {
1364 // If no other collector is requested explicitly,
1365 // let the VM select the collector based on
1366 // machine class and automatic selection policy.
1367 if (!UseSerialGC &&
1368 !UseConcMarkSweepGC &&
1369 !UseG1GC &&
1370 !UseParNewGC &&
1371 !DumpSharedSpaces &&
1372 FLAG_IS_DEFAULT(UseParallelGC)) {
1373 if (should_auto_select_low_pause_collector()) {
1374 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1375 } else {
1376 FLAG_SET_ERGO(bool, UseParallelGC, true);
1377 }
1378 no_shared_spaces();
1379 }
1380 }
1382 #ifndef ZERO
1383 #ifdef _LP64
1384 // Check that UseCompressedOops can be set with the max heap size allocated
1385 // by ergonomics.
1386 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1387 #if !defined(COMPILER1) || defined(TIERED)
1388 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1389 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1390 }
1391 #endif
1392 #ifdef _WIN64
1393 if (UseLargePages && UseCompressedOops) {
1394 // Cannot allocate guard pages for implicit checks in indexed addressing
1395 // mode, when large pages are specified on windows.
1396 // This flag could be switched ON if narrow oop base address is set to 0,
1397 // see code in Universe::initialize_heap().
1398 Universe::set_narrow_oop_use_implicit_null_checks(false);
1399 }
1400 #endif // _WIN64
1401 } else {
1402 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1403 warning("Max heap size too large for Compressed Oops");
1404 FLAG_SET_DEFAULT(UseCompressedOops, false);
1405 }
1406 }
1407 // Also checks that certain machines are slower with compressed oops
1408 // in vm_version initialization code.
1409 #endif // _LP64
1410 #endif // !ZERO
1411 }
1413 void Arguments::set_parallel_gc_flags() {
1414 assert(UseParallelGC || UseParallelOldGC, "Error");
1415 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1416 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1417 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1418 }
1419 FLAG_SET_DEFAULT(UseParallelGC, true);
1421 // If no heap maximum was requested explicitly, use some reasonable fraction
1422 // of the physical memory, up to a maximum of 1GB.
1423 if (UseParallelGC) {
1424 FLAG_SET_DEFAULT(ParallelGCThreads,
1425 Abstract_VM_Version::parallel_worker_threads());
1427 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1428 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1429 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1430 // See CR 6362902 for details.
1431 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1432 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1433 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1434 }
1435 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1436 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1437 }
1438 }
1440 if (UseParallelOldGC) {
1441 // Par compact uses lower default values since they are treated as
1442 // minimums. These are different defaults because of the different
1443 // interpretation and are not ergonomically set.
1444 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1445 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1446 }
1447 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1448 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1449 }
1450 }
1451 }
1452 if (UseNUMA) {
1453 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1454 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1455 }
1456 // For those collectors or operating systems (eg, Windows) that do
1457 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1458 UseNUMAInterleaving = true;
1459 }
1460 }
1462 void Arguments::set_g1_gc_flags() {
1463 assert(UseG1GC, "Error");
1464 #ifdef COMPILER1
1465 FastTLABRefill = false;
1466 #endif
1467 FLAG_SET_DEFAULT(ParallelGCThreads,
1468 Abstract_VM_Version::parallel_worker_threads());
1469 if (ParallelGCThreads == 0) {
1470 FLAG_SET_DEFAULT(ParallelGCThreads,
1471 Abstract_VM_Version::parallel_worker_threads());
1472 }
1473 no_shared_spaces();
1475 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1476 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1477 }
1478 if (PrintGCDetails && Verbose) {
1479 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1480 MarkStackSize / K, MarkStackSizeMax / K);
1481 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1482 }
1484 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1485 // In G1, we want the default GC overhead goal to be higher than
1486 // say in PS. So we set it here to 10%. Otherwise the heap might
1487 // be expanded more aggressively than we would like it to. In
1488 // fact, even 10% seems to not be high enough in some cases
1489 // (especially small GC stress tests that the main thing they do
1490 // is allocation). We might consider increase it further.
1491 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1492 }
1493 }
1495 void Arguments::set_heap_size() {
1496 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1497 // Deprecated flag
1498 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1499 }
1501 const julong phys_mem =
1502 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1503 : (julong)MaxRAM;
1505 // If the maximum heap size has not been set with -Xmx,
1506 // then set it as fraction of the size of physical memory,
1507 // respecting the maximum and minimum sizes of the heap.
1508 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1509 julong reasonable_max = phys_mem / MaxRAMFraction;
1511 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1512 // Small physical memory, so use a minimum fraction of it for the heap
1513 reasonable_max = phys_mem / MinRAMFraction;
1514 } else {
1515 // Not-small physical memory, so require a heap at least
1516 // as large as MaxHeapSize
1517 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1518 }
1519 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1520 // Limit the heap size to ErgoHeapSizeLimit
1521 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1522 }
1523 if (UseCompressedOops) {
1524 // Limit the heap size to the maximum possible when using compressed oops
1525 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1526 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1527 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1528 // but it should be not less than default MaxHeapSize.
1529 max_coop_heap -= HeapBaseMinAddress;
1530 }
1531 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1532 }
1533 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1535 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1536 // An initial heap size was specified on the command line,
1537 // so be sure that the maximum size is consistent. Done
1538 // after call to allocatable_physical_memory because that
1539 // method might reduce the allocation size.
1540 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1541 }
1543 if (PrintGCDetails && Verbose) {
1544 // Cannot use gclog_or_tty yet.
1545 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1546 }
1547 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1548 }
1550 // If the initial_heap_size has not been set with InitialHeapSize
1551 // or -Xms, then set it as fraction of the size of physical memory,
1552 // respecting the maximum and minimum sizes of the heap.
1553 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1554 julong reasonable_minimum = (julong)(OldSize + NewSize);
1556 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1558 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1560 julong reasonable_initial = phys_mem / InitialRAMFraction;
1562 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1563 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1565 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1567 if (PrintGCDetails && Verbose) {
1568 // Cannot use gclog_or_tty yet.
1569 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1570 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1571 }
1572 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1573 set_min_heap_size((uintx)reasonable_minimum);
1574 }
1575 }
1577 // This must be called after ergonomics because we want bytecode rewriting
1578 // if the server compiler is used, or if UseSharedSpaces is disabled.
1579 void Arguments::set_bytecode_flags() {
1580 // Better not attempt to store into a read-only space.
1581 if (UseSharedSpaces) {
1582 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1583 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1584 }
1586 if (!RewriteBytecodes) {
1587 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1588 }
1589 }
1591 // Aggressive optimization flags -XX:+AggressiveOpts
1592 void Arguments::set_aggressive_opts_flags() {
1593 #ifdef COMPILER2
1594 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1595 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1596 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1597 }
1598 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1599 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1600 }
1602 // Feed the cache size setting into the JDK
1603 char buffer[1024];
1604 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1605 add_property(buffer);
1606 }
1607 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1608 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1609 }
1610 #endif
1612 if (AggressiveOpts) {
1613 // Sample flag setting code
1614 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1615 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1616 // }
1617 }
1618 }
1620 //===========================================================================================================
1621 // Parsing of java.compiler property
1623 void Arguments::process_java_compiler_argument(char* arg) {
1624 // For backwards compatibility, Djava.compiler=NONE or ""
1625 // causes us to switch to -Xint mode UNLESS -Xdebug
1626 // is also specified.
1627 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1628 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1629 }
1630 }
1632 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1633 _sun_java_launcher = strdup(launcher);
1634 if (strcmp("gamma", _sun_java_launcher) == 0) {
1635 _created_by_gamma_launcher = true;
1636 }
1637 }
1639 bool Arguments::created_by_java_launcher() {
1640 assert(_sun_java_launcher != NULL, "property must have value");
1641 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1642 }
1644 bool Arguments::created_by_gamma_launcher() {
1645 return _created_by_gamma_launcher;
1646 }
1648 //===========================================================================================================
1649 // Parsing of main arguments
1651 bool Arguments::verify_interval(uintx val, uintx min,
1652 uintx max, const char* name) {
1653 // Returns true iff value is in the inclusive interval [min..max]
1654 // false, otherwise.
1655 if (val >= min && val <= max) {
1656 return true;
1657 }
1658 jio_fprintf(defaultStream::error_stream(),
1659 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1660 " and " UINTX_FORMAT "\n",
1661 name, val, min, max);
1662 return false;
1663 }
1665 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1666 // Returns true if given value is at least specified min threshold
1667 // false, otherwise.
1668 if (val >= min ) {
1669 return true;
1670 }
1671 jio_fprintf(defaultStream::error_stream(),
1672 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1673 name, val, min);
1674 return false;
1675 }
1677 bool Arguments::verify_percentage(uintx value, const char* name) {
1678 if (value <= 100) {
1679 return true;
1680 }
1681 jio_fprintf(defaultStream::error_stream(),
1682 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1683 name, value);
1684 return false;
1685 }
1687 static void force_serial_gc() {
1688 FLAG_SET_DEFAULT(UseSerialGC, true);
1689 FLAG_SET_DEFAULT(UseParNewGC, false);
1690 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1691 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1692 FLAG_SET_DEFAULT(UseParallelGC, false);
1693 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1694 FLAG_SET_DEFAULT(UseG1GC, false);
1695 }
1697 static bool verify_serial_gc_flags() {
1698 return (UseSerialGC &&
1699 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1700 UseParallelGC || UseParallelOldGC));
1701 }
1703 // check if do gclog rotation
1704 // +UseGCLogFileRotation is a must,
1705 // no gc log rotation when log file not supplied or
1706 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1707 void check_gclog_consistency() {
1708 if (UseGCLogFileRotation) {
1709 if ((Arguments::gc_log_filename() == NULL) ||
1710 (NumberOfGCLogFiles == 0) ||
1711 (GCLogFileSize == 0)) {
1712 jio_fprintf(defaultStream::output_stream(),
1713 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1714 "where num_of_file > 0 and num_of_size > 0\n"
1715 "GC log rotation is turned off\n");
1716 UseGCLogFileRotation = false;
1717 }
1718 }
1720 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1721 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1722 jio_fprintf(defaultStream::output_stream(),
1723 "GCLogFileSize changed to minimum 8K\n");
1724 }
1725 }
1727 // Check consistency of GC selection
1728 bool Arguments::check_gc_consistency() {
1729 check_gclog_consistency();
1730 bool status = true;
1731 // Ensure that the user has not selected conflicting sets
1732 // of collectors. [Note: this check is merely a user convenience;
1733 // collectors over-ride each other so that only a non-conflicting
1734 // set is selected; however what the user gets is not what they
1735 // may have expected from the combination they asked for. It's
1736 // better to reduce user confusion by not allowing them to
1737 // select conflicting combinations.
1738 uint i = 0;
1739 if (UseSerialGC) i++;
1740 if (UseConcMarkSweepGC || UseParNewGC) i++;
1741 if (UseParallelGC || UseParallelOldGC) i++;
1742 if (UseG1GC) i++;
1743 if (i > 1) {
1744 jio_fprintf(defaultStream::error_stream(),
1745 "Conflicting collector combinations in option list; "
1746 "please refer to the release notes for the combinations "
1747 "allowed\n");
1748 status = false;
1749 }
1751 return status;
1752 }
1754 // Check stack pages settings
1755 bool Arguments::check_stack_pages()
1756 {
1757 bool status = true;
1758 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1759 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1760 // greater stack shadow pages can't generate instruction to bang stack
1761 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1762 return status;
1763 }
1765 // Check the consistency of vm_init_args
1766 bool Arguments::check_vm_args_consistency() {
1767 // Method for adding checks for flag consistency.
1768 // The intent is to warn the user of all possible conflicts,
1769 // before returning an error.
1770 // Note: Needs platform-dependent factoring.
1771 bool status = true;
1773 #if ( (defined(COMPILER2) && defined(SPARC)))
1774 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1775 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1776 // x86. Normally, VM_Version_init must be called from init_globals in
1777 // init.cpp, which is called by the initial java thread *after* arguments
1778 // have been parsed. VM_Version_init gets called twice on sparc.
1779 extern void VM_Version_init();
1780 VM_Version_init();
1781 if (!VM_Version::has_v9()) {
1782 jio_fprintf(defaultStream::error_stream(),
1783 "V8 Machine detected, Server requires V9\n");
1784 status = false;
1785 }
1786 #endif /* COMPILER2 && SPARC */
1788 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1789 // builds so the cost of stack banging can be measured.
1790 #if (defined(PRODUCT) && defined(SOLARIS))
1791 if (!UseBoundThreads && !UseStackBanging) {
1792 jio_fprintf(defaultStream::error_stream(),
1793 "-UseStackBanging conflicts with -UseBoundThreads\n");
1795 status = false;
1796 }
1797 #endif
1799 if (TLABRefillWasteFraction == 0) {
1800 jio_fprintf(defaultStream::error_stream(),
1801 "TLABRefillWasteFraction should be a denominator, "
1802 "not " SIZE_FORMAT "\n",
1803 TLABRefillWasteFraction);
1804 status = false;
1805 }
1807 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1808 "AdaptiveSizePolicyWeight");
1809 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1810 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1811 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1812 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1814 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1815 jio_fprintf(defaultStream::error_stream(),
1816 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1817 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1818 MinHeapFreeRatio, MaxHeapFreeRatio);
1819 status = false;
1820 }
1821 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1822 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1824 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1825 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1826 }
1828 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1829 // Settings to encourage splitting.
1830 if (!FLAG_IS_CMDLINE(NewRatio)) {
1831 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1832 }
1833 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1834 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1835 }
1836 }
1838 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1839 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1840 if (GCTimeLimit == 100) {
1841 // Turn off gc-overhead-limit-exceeded checks
1842 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1843 }
1845 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1847 status = status && check_gc_consistency();
1848 status = status && check_stack_pages();
1850 if (_has_alloc_profile) {
1851 if (UseParallelGC || UseParallelOldGC) {
1852 jio_fprintf(defaultStream::error_stream(),
1853 "error: invalid argument combination.\n"
1854 "Allocation profiling (-Xaprof) cannot be used together with "
1855 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1856 status = false;
1857 }
1858 if (UseConcMarkSweepGC) {
1859 jio_fprintf(defaultStream::error_stream(),
1860 "error: invalid argument combination.\n"
1861 "Allocation profiling (-Xaprof) cannot be used together with "
1862 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1863 status = false;
1864 }
1865 }
1867 if (CMSIncrementalMode) {
1868 if (!UseConcMarkSweepGC) {
1869 jio_fprintf(defaultStream::error_stream(),
1870 "error: invalid argument combination.\n"
1871 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1872 "selected in order\nto use CMSIncrementalMode.\n");
1873 status = false;
1874 } else {
1875 status = status && verify_percentage(CMSIncrementalDutyCycle,
1876 "CMSIncrementalDutyCycle");
1877 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1878 "CMSIncrementalDutyCycleMin");
1879 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1880 "CMSIncrementalSafetyFactor");
1881 status = status && verify_percentage(CMSIncrementalOffset,
1882 "CMSIncrementalOffset");
1883 status = status && verify_percentage(CMSExpAvgFactor,
1884 "CMSExpAvgFactor");
1885 // If it was not set on the command line, set
1886 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1887 if (CMSInitiatingOccupancyFraction < 0) {
1888 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1889 }
1890 }
1891 }
1893 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1894 // insists that we hold the requisite locks so that the iteration is
1895 // MT-safe. For the verification at start-up and shut-down, we don't
1896 // yet have a good way of acquiring and releasing these locks,
1897 // which are not visible at the CollectedHeap level. We want to
1898 // be able to acquire these locks and then do the iteration rather
1899 // than just disable the lock verification. This will be fixed under
1900 // bug 4788986.
1901 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1902 if (VerifyGCStartAt == 0) {
1903 warning("Heap verification at start-up disabled "
1904 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1905 VerifyGCStartAt = 1; // Disable verification at start-up
1906 }
1907 if (VerifyBeforeExit) {
1908 warning("Heap verification at shutdown disabled "
1909 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1910 VerifyBeforeExit = false; // Disable verification at shutdown
1911 }
1912 }
1914 // Note: only executed in non-PRODUCT mode
1915 if (!UseAsyncConcMarkSweepGC &&
1916 (ExplicitGCInvokesConcurrent ||
1917 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1918 jio_fprintf(defaultStream::error_stream(),
1919 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1920 " with -UseAsyncConcMarkSweepGC");
1921 status = false;
1922 }
1924 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1926 #ifndef SERIALGC
1927 if (UseG1GC) {
1928 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1929 "InitiatingHeapOccupancyPercent");
1930 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1931 "G1RefProcDrainInterval");
1932 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1933 "G1ConcMarkStepDurationMillis");
1934 }
1935 #endif
1937 status = status && verify_interval(RefDiscoveryPolicy,
1938 ReferenceProcessor::DiscoveryPolicyMin,
1939 ReferenceProcessor::DiscoveryPolicyMax,
1940 "RefDiscoveryPolicy");
1942 // Limit the lower bound of this flag to 1 as it is used in a division
1943 // expression.
1944 status = status && verify_interval(TLABWasteTargetPercent,
1945 1, 100, "TLABWasteTargetPercent");
1947 status = status && verify_object_alignment();
1949 return status;
1950 }
1952 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1953 const char* option_type) {
1954 if (ignore) return false;
1956 const char* spacer = " ";
1957 if (option_type == NULL) {
1958 option_type = ++spacer; // Set both to the empty string.
1959 }
1961 if (os::obsolete_option(option)) {
1962 jio_fprintf(defaultStream::error_stream(),
1963 "Obsolete %s%soption: %s\n", option_type, spacer,
1964 option->optionString);
1965 return false;
1966 } else {
1967 jio_fprintf(defaultStream::error_stream(),
1968 "Unrecognized %s%soption: %s\n", option_type, spacer,
1969 option->optionString);
1970 return true;
1971 }
1972 }
1974 static const char* user_assertion_options[] = {
1975 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1976 };
1978 static const char* system_assertion_options[] = {
1979 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1980 };
1982 // Return true if any of the strings in null-terminated array 'names' matches.
1983 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1984 // the option must match exactly.
1985 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1986 bool tail_allowed) {
1987 for (/* empty */; *names != NULL; ++names) {
1988 if (match_option(option, *names, tail)) {
1989 if (**tail == '\0' || tail_allowed && **tail == ':') {
1990 return true;
1991 }
1992 }
1993 }
1994 return false;
1995 }
1997 bool Arguments::parse_uintx(const char* value,
1998 uintx* uintx_arg,
1999 uintx min_size) {
2001 // Check the sign first since atomull() parses only unsigned values.
2002 bool value_is_positive = !(*value == '-');
2004 if (value_is_positive) {
2005 julong n;
2006 bool good_return = atomull(value, &n);
2007 if (good_return) {
2008 bool above_minimum = n >= min_size;
2009 bool value_is_too_large = n > max_uintx;
2011 if (above_minimum && !value_is_too_large) {
2012 *uintx_arg = n;
2013 return true;
2014 }
2015 }
2016 }
2017 return false;
2018 }
2020 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2021 julong* long_arg,
2022 julong min_size) {
2023 if (!atomull(s, long_arg)) return arg_unreadable;
2024 return check_memory_size(*long_arg, min_size);
2025 }
2027 // Parse JavaVMInitArgs structure
2029 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2030 // For components of the system classpath.
2031 SysClassPath scp(Arguments::get_sysclasspath());
2032 bool scp_assembly_required = false;
2034 // Save default settings for some mode flags
2035 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2036 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2037 Arguments::_ClipInlining = ClipInlining;
2038 Arguments::_BackgroundCompilation = BackgroundCompilation;
2040 // Setup flags for mixed which is the default
2041 set_mode_flags(_mixed);
2043 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2044 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2045 if (result != JNI_OK) {
2046 return result;
2047 }
2049 // Parse JavaVMInitArgs structure passed in
2050 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2051 if (result != JNI_OK) {
2052 return result;
2053 }
2055 if (AggressiveOpts) {
2056 // Insert alt-rt.jar between user-specified bootclasspath
2057 // prefix and the default bootclasspath. os::set_boot_path()
2058 // uses meta_index_dir as the default bootclasspath directory.
2059 const char* altclasses_jar = "alt-rt.jar";
2060 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2061 strlen(altclasses_jar);
2062 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2063 strcpy(altclasses_path, get_meta_index_dir());
2064 strcat(altclasses_path, altclasses_jar);
2065 scp.add_suffix_to_prefix(altclasses_path);
2066 scp_assembly_required = true;
2067 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2068 }
2070 if (WhiteBoxAPI) {
2071 // Append wb.jar to bootclasspath if enabled
2072 const char* wb_jar = "wb.jar";
2073 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2074 strlen(wb_jar);
2075 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal);
2076 strcpy(wb_path, get_meta_index_dir());
2077 strcat(wb_path, wb_jar);
2078 scp.add_suffix(wb_path);
2079 scp_assembly_required = true;
2080 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal);
2081 }
2083 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2084 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2085 if (result != JNI_OK) {
2086 return result;
2087 }
2089 // Do final processing now that all arguments have been parsed
2090 result = finalize_vm_init_args(&scp, scp_assembly_required);
2091 if (result != JNI_OK) {
2092 return result;
2093 }
2095 return JNI_OK;
2096 }
2098 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2099 SysClassPath* scp_p,
2100 bool* scp_assembly_required_p,
2101 FlagValueOrigin origin) {
2102 // Remaining part of option string
2103 const char* tail;
2105 // iterate over arguments
2106 for (int index = 0; index < args->nOptions; index++) {
2107 bool is_absolute_path = false; // for -agentpath vs -agentlib
2109 const JavaVMOption* option = args->options + index;
2111 if (!match_option(option, "-Djava.class.path", &tail) &&
2112 !match_option(option, "-Dsun.java.command", &tail) &&
2113 !match_option(option, "-Dsun.java.launcher", &tail)) {
2115 // add all jvm options to the jvm_args string. This string
2116 // is used later to set the java.vm.args PerfData string constant.
2117 // the -Djava.class.path and the -Dsun.java.command options are
2118 // omitted from jvm_args string as each have their own PerfData
2119 // string constant object.
2120 build_jvm_args(option->optionString);
2121 }
2123 // -verbose:[class/gc/jni]
2124 if (match_option(option, "-verbose", &tail)) {
2125 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2126 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2127 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2128 } else if (!strcmp(tail, ":gc")) {
2129 FLAG_SET_CMDLINE(bool, PrintGC, true);
2130 } else if (!strcmp(tail, ":jni")) {
2131 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2132 }
2133 // -da / -ea / -disableassertions / -enableassertions
2134 // These accept an optional class/package name separated by a colon, e.g.,
2135 // -da:java.lang.Thread.
2136 } else if (match_option(option, user_assertion_options, &tail, true)) {
2137 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2138 if (*tail == '\0') {
2139 JavaAssertions::setUserClassDefault(enable);
2140 } else {
2141 assert(*tail == ':', "bogus match by match_option()");
2142 JavaAssertions::addOption(tail + 1, enable);
2143 }
2144 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2145 } else if (match_option(option, system_assertion_options, &tail, false)) {
2146 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2147 JavaAssertions::setSystemClassDefault(enable);
2148 // -bootclasspath:
2149 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2150 scp_p->reset_path(tail);
2151 *scp_assembly_required_p = true;
2152 // -bootclasspath/a:
2153 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2154 scp_p->add_suffix(tail);
2155 *scp_assembly_required_p = true;
2156 // -bootclasspath/p:
2157 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2158 scp_p->add_prefix(tail);
2159 *scp_assembly_required_p = true;
2160 // -Xrun
2161 } else if (match_option(option, "-Xrun", &tail)) {
2162 if (tail != NULL) {
2163 const char* pos = strchr(tail, ':');
2164 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2165 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2166 name[len] = '\0';
2168 char *options = NULL;
2169 if(pos != NULL) {
2170 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2171 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2172 }
2173 #ifdef JVMTI_KERNEL
2174 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2175 warning("profiling and debugging agents are not supported with Kernel VM");
2176 } else
2177 #endif // JVMTI_KERNEL
2178 add_init_library(name, options);
2179 }
2180 // -agentlib and -agentpath
2181 } else if (match_option(option, "-agentlib:", &tail) ||
2182 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2183 if(tail != NULL) {
2184 const char* pos = strchr(tail, '=');
2185 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2186 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2187 name[len] = '\0';
2189 char *options = NULL;
2190 if(pos != NULL) {
2191 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2192 }
2193 #ifdef JVMTI_KERNEL
2194 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2195 warning("profiling and debugging agents are not supported with Kernel VM");
2196 } else
2197 #endif // JVMTI_KERNEL
2198 add_init_agent(name, options, is_absolute_path);
2200 }
2201 // -javaagent
2202 } else if (match_option(option, "-javaagent:", &tail)) {
2203 if(tail != NULL) {
2204 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2205 add_init_agent("instrument", options, false);
2206 }
2207 // -Xnoclassgc
2208 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2209 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2210 // -Xincgc: i-CMS
2211 } else if (match_option(option, "-Xincgc", &tail)) {
2212 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2213 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2214 // -Xnoincgc: no i-CMS
2215 } else if (match_option(option, "-Xnoincgc", &tail)) {
2216 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2217 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2218 // -Xconcgc
2219 } else if (match_option(option, "-Xconcgc", &tail)) {
2220 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2221 // -Xnoconcgc
2222 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2223 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2224 // -Xbatch
2225 } else if (match_option(option, "-Xbatch", &tail)) {
2226 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2227 // -Xmn for compatibility with other JVM vendors
2228 } else if (match_option(option, "-Xmn", &tail)) {
2229 julong long_initial_eden_size = 0;
2230 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2231 if (errcode != arg_in_range) {
2232 jio_fprintf(defaultStream::error_stream(),
2233 "Invalid initial eden size: %s\n", option->optionString);
2234 describe_range_error(errcode);
2235 return JNI_EINVAL;
2236 }
2237 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2238 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2239 // -Xms
2240 } else if (match_option(option, "-Xms", &tail)) {
2241 julong long_initial_heap_size = 0;
2242 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2243 if (errcode != arg_in_range) {
2244 jio_fprintf(defaultStream::error_stream(),
2245 "Invalid initial heap size: %s\n", option->optionString);
2246 describe_range_error(errcode);
2247 return JNI_EINVAL;
2248 }
2249 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2250 // Currently the minimum size and the initial heap sizes are the same.
2251 set_min_heap_size(InitialHeapSize);
2252 // -Xmx
2253 } else if (match_option(option, "-Xmx", &tail)) {
2254 julong long_max_heap_size = 0;
2255 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2256 if (errcode != arg_in_range) {
2257 jio_fprintf(defaultStream::error_stream(),
2258 "Invalid maximum heap size: %s\n", option->optionString);
2259 describe_range_error(errcode);
2260 return JNI_EINVAL;
2261 }
2262 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2263 // Xmaxf
2264 } else if (match_option(option, "-Xmaxf", &tail)) {
2265 int maxf = (int)(atof(tail) * 100);
2266 if (maxf < 0 || maxf > 100) {
2267 jio_fprintf(defaultStream::error_stream(),
2268 "Bad max heap free percentage size: %s\n",
2269 option->optionString);
2270 return JNI_EINVAL;
2271 } else {
2272 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2273 }
2274 // Xminf
2275 } else if (match_option(option, "-Xminf", &tail)) {
2276 int minf = (int)(atof(tail) * 100);
2277 if (minf < 0 || minf > 100) {
2278 jio_fprintf(defaultStream::error_stream(),
2279 "Bad min heap free percentage size: %s\n",
2280 option->optionString);
2281 return JNI_EINVAL;
2282 } else {
2283 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2284 }
2285 // -Xss
2286 } else if (match_option(option, "-Xss", &tail)) {
2287 julong long_ThreadStackSize = 0;
2288 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2289 if (errcode != arg_in_range) {
2290 jio_fprintf(defaultStream::error_stream(),
2291 "Invalid thread stack size: %s\n", option->optionString);
2292 describe_range_error(errcode);
2293 return JNI_EINVAL;
2294 }
2295 // Internally track ThreadStackSize in units of 1024 bytes.
2296 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2297 round_to((int)long_ThreadStackSize, K) / K);
2298 // -Xoss
2299 } else if (match_option(option, "-Xoss", &tail)) {
2300 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2301 // -Xmaxjitcodesize
2302 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2303 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2304 julong long_ReservedCodeCacheSize = 0;
2305 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2306 (size_t)InitialCodeCacheSize);
2307 if (errcode != arg_in_range) {
2308 jio_fprintf(defaultStream::error_stream(),
2309 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2310 option->optionString, InitialCodeCacheSize/K);
2311 describe_range_error(errcode);
2312 return JNI_EINVAL;
2313 }
2314 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2315 // -green
2316 } else if (match_option(option, "-green", &tail)) {
2317 jio_fprintf(defaultStream::error_stream(),
2318 "Green threads support not available\n");
2319 return JNI_EINVAL;
2320 // -native
2321 } else if (match_option(option, "-native", &tail)) {
2322 // HotSpot always uses native threads, ignore silently for compatibility
2323 // -Xsqnopause
2324 } else if (match_option(option, "-Xsqnopause", &tail)) {
2325 // EVM option, ignore silently for compatibility
2326 // -Xrs
2327 } else if (match_option(option, "-Xrs", &tail)) {
2328 // Classic/EVM option, new functionality
2329 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2330 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2331 // change default internal VM signals used - lower case for back compat
2332 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2333 // -Xoptimize
2334 } else if (match_option(option, "-Xoptimize", &tail)) {
2335 // EVM option, ignore silently for compatibility
2336 // -Xprof
2337 } else if (match_option(option, "-Xprof", &tail)) {
2338 #ifndef FPROF_KERNEL
2339 _has_profile = true;
2340 #else // FPROF_KERNEL
2341 // do we have to exit?
2342 warning("Kernel VM does not support flat profiling.");
2343 #endif // FPROF_KERNEL
2344 // -Xaprof
2345 } else if (match_option(option, "-Xaprof", &tail)) {
2346 _has_alloc_profile = true;
2347 // -Xconcurrentio
2348 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2349 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2350 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2351 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2352 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2353 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2355 // -Xinternalversion
2356 } else if (match_option(option, "-Xinternalversion", &tail)) {
2357 jio_fprintf(defaultStream::output_stream(), "%s\n",
2358 VM_Version::internal_vm_info_string());
2359 vm_exit(0);
2360 #ifndef PRODUCT
2361 // -Xprintflags
2362 } else if (match_option(option, "-Xprintflags", &tail)) {
2363 CommandLineFlags::printFlags(tty, false);
2364 vm_exit(0);
2365 #endif
2366 // -D
2367 } else if (match_option(option, "-D", &tail)) {
2368 if (!add_property(tail)) {
2369 return JNI_ENOMEM;
2370 }
2371 // Out of the box management support
2372 if (match_option(option, "-Dcom.sun.management", &tail)) {
2373 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2374 }
2375 // -Xint
2376 } else if (match_option(option, "-Xint", &tail)) {
2377 set_mode_flags(_int);
2378 // -Xmixed
2379 } else if (match_option(option, "-Xmixed", &tail)) {
2380 set_mode_flags(_mixed);
2381 // -Xcomp
2382 } else if (match_option(option, "-Xcomp", &tail)) {
2383 // for testing the compiler; turn off all flags that inhibit compilation
2384 set_mode_flags(_comp);
2386 // -Xshare:dump
2387 } else if (match_option(option, "-Xshare:dump", &tail)) {
2388 #ifdef TIERED
2389 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2390 set_mode_flags(_int); // Prevent compilation, which creates objects
2391 #elif defined(COMPILER2)
2392 vm_exit_during_initialization(
2393 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2394 #elif defined(KERNEL)
2395 vm_exit_during_initialization(
2396 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2397 #else
2398 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2399 set_mode_flags(_int); // Prevent compilation, which creates objects
2400 #endif
2401 // -Xshare:on
2402 } else if (match_option(option, "-Xshare:on", &tail)) {
2403 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2404 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2405 // -Xshare:auto
2406 } else if (match_option(option, "-Xshare:auto", &tail)) {
2407 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2408 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2409 // -Xshare:off
2410 } else if (match_option(option, "-Xshare:off", &tail)) {
2411 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2412 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2414 // -Xverify
2415 } else if (match_option(option, "-Xverify", &tail)) {
2416 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2417 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2418 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2419 } else if (strcmp(tail, ":remote") == 0) {
2420 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2421 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2422 } else if (strcmp(tail, ":none") == 0) {
2423 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2424 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2425 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2426 return JNI_EINVAL;
2427 }
2428 // -Xdebug
2429 } else if (match_option(option, "-Xdebug", &tail)) {
2430 // note this flag has been used, then ignore
2431 set_xdebug_mode(true);
2432 // -Xnoagent
2433 } else if (match_option(option, "-Xnoagent", &tail)) {
2434 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2435 } else if (match_option(option, "-Xboundthreads", &tail)) {
2436 // Bind user level threads to kernel threads (Solaris only)
2437 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2438 } else if (match_option(option, "-Xloggc:", &tail)) {
2439 // Redirect GC output to the file. -Xloggc:<filename>
2440 // ostream_init_log(), when called will use this filename
2441 // to initialize a fileStream.
2442 _gc_log_filename = strdup(tail);
2443 FLAG_SET_CMDLINE(bool, PrintGC, true);
2444 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2446 // JNI hooks
2447 } else if (match_option(option, "-Xcheck", &tail)) {
2448 if (!strcmp(tail, ":jni")) {
2449 CheckJNICalls = true;
2450 } else if (is_bad_option(option, args->ignoreUnrecognized,
2451 "check")) {
2452 return JNI_EINVAL;
2453 }
2454 } else if (match_option(option, "vfprintf", &tail)) {
2455 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2456 } else if (match_option(option, "exit", &tail)) {
2457 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2458 } else if (match_option(option, "abort", &tail)) {
2459 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2460 // -XX:+AggressiveHeap
2461 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2463 // This option inspects the machine and attempts to set various
2464 // parameters to be optimal for long-running, memory allocation
2465 // intensive jobs. It is intended for machines with large
2466 // amounts of cpu and memory.
2468 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2469 // VM, but we may not be able to represent the total physical memory
2470 // available (like having 8gb of memory on a box but using a 32bit VM).
2471 // Thus, we need to make sure we're using a julong for intermediate
2472 // calculations.
2473 julong initHeapSize;
2474 julong total_memory = os::physical_memory();
2476 if (total_memory < (julong)256*M) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2479 vm_exit(1);
2480 }
2482 // The heap size is half of available memory, or (at most)
2483 // all of possible memory less 160mb (leaving room for the OS
2484 // when using ISM). This is the maximum; because adaptive sizing
2485 // is turned on below, the actual space used may be smaller.
2487 initHeapSize = MIN2(total_memory / (julong)2,
2488 total_memory - (julong)160*M);
2490 // Make sure that if we have a lot of memory we cap the 32 bit
2491 // process space. The 64bit VM version of this function is a nop.
2492 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2494 // The perm gen is separate but contiguous with the
2495 // object heap (and is reserved with it) so subtract it
2496 // from the heap size.
2497 if (initHeapSize > MaxPermSize) {
2498 initHeapSize = initHeapSize - MaxPermSize;
2499 } else {
2500 warning("AggressiveHeap and MaxPermSize values may conflict");
2501 }
2503 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2504 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2505 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2506 // Currently the minimum size and the initial heap sizes are the same.
2507 set_min_heap_size(initHeapSize);
2508 }
2509 if (FLAG_IS_DEFAULT(NewSize)) {
2510 // Make the young generation 3/8ths of the total heap.
2511 FLAG_SET_CMDLINE(uintx, NewSize,
2512 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2513 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2514 }
2516 FLAG_SET_DEFAULT(UseLargePages, true);
2518 // Increase some data structure sizes for efficiency
2519 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2520 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2521 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2523 // See the OldPLABSize comment below, but replace 'after promotion'
2524 // with 'after copying'. YoungPLABSize is the size of the survivor
2525 // space per-gc-thread buffers. The default is 4kw.
2526 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2528 // OldPLABSize is the size of the buffers in the old gen that
2529 // UseParallelGC uses to promote live data that doesn't fit in the
2530 // survivor spaces. At any given time, there's one for each gc thread.
2531 // The default size is 1kw. These buffers are rarely used, since the
2532 // survivor spaces are usually big enough. For specjbb, however, there
2533 // are occasions when there's lots of live data in the young gen
2534 // and we end up promoting some of it. We don't have a definite
2535 // explanation for why bumping OldPLABSize helps, but the theory
2536 // is that a bigger PLAB results in retaining something like the
2537 // original allocation order after promotion, which improves mutator
2538 // locality. A minor effect may be that larger PLABs reduce the
2539 // number of PLAB allocation events during gc. The value of 8kw
2540 // was arrived at by experimenting with specjbb.
2541 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2543 // Enable parallel GC and adaptive generation sizing
2544 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2545 FLAG_SET_DEFAULT(ParallelGCThreads,
2546 Abstract_VM_Version::parallel_worker_threads());
2548 // Encourage steady state memory management
2549 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2551 // This appears to improve mutator locality
2552 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2554 // Get around early Solaris scheduling bug
2555 // (affinity vs other jobs on system)
2556 // but disallow DR and offlining (5008695).
2557 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2559 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2560 // The last option must always win.
2561 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2562 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2563 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2564 // The last option must always win.
2565 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2566 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2567 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2568 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Please use CMSClassUnloadingEnabled in place of "
2571 "CMSPermGenSweepingEnabled in the future\n");
2572 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2573 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2574 jio_fprintf(defaultStream::error_stream(),
2575 "Please use -XX:+UseGCOverheadLimit in place of "
2576 "-XX:+UseGCTimeLimit in the future\n");
2577 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2578 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2579 jio_fprintf(defaultStream::error_stream(),
2580 "Please use -XX:-UseGCOverheadLimit in place of "
2581 "-XX:-UseGCTimeLimit in the future\n");
2582 // The TLE options are for compatibility with 1.3 and will be
2583 // removed without notice in a future release. These options
2584 // are not to be documented.
2585 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2586 // No longer used.
2587 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2588 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2589 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2590 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2591 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2592 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2593 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2594 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2595 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2596 // No longer used.
2597 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2598 julong long_tlab_size = 0;
2599 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2600 if (errcode != arg_in_range) {
2601 jio_fprintf(defaultStream::error_stream(),
2602 "Invalid TLAB size: %s\n", option->optionString);
2603 describe_range_error(errcode);
2604 return JNI_EINVAL;
2605 }
2606 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2607 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2608 // No longer used.
2609 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2610 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2611 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2612 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2613 SOLARIS_ONLY(
2614 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2615 warning("-XX:+UsePermISM is obsolete.");
2616 FLAG_SET_CMDLINE(bool, UseISM, true);
2617 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2618 FLAG_SET_CMDLINE(bool, UseISM, false);
2619 )
2620 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2621 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2622 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2623 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2624 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2625 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2626 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2627 #if defined(DTRACE_ENABLED)
2628 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2629 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2630 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2631 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2632 #else // defined(DTRACE_ENABLED)
2633 jio_fprintf(defaultStream::error_stream(),
2634 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2635 return JNI_EINVAL;
2636 #endif // defined(DTRACE_ENABLED)
2637 #ifdef ASSERT
2638 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2639 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2640 // disable scavenge before parallel mark-compact
2641 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2642 #endif
2643 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2644 julong cms_blocks_to_claim = (julong)atol(tail);
2645 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2646 jio_fprintf(defaultStream::error_stream(),
2647 "Please use -XX:OldPLABSize in place of "
2648 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2649 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2650 julong cms_blocks_to_claim = (julong)atol(tail);
2651 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2652 jio_fprintf(defaultStream::error_stream(),
2653 "Please use -XX:OldPLABSize in place of "
2654 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2655 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2656 julong old_plab_size = 0;
2657 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2658 if (errcode != arg_in_range) {
2659 jio_fprintf(defaultStream::error_stream(),
2660 "Invalid old PLAB size: %s\n", option->optionString);
2661 describe_range_error(errcode);
2662 return JNI_EINVAL;
2663 }
2664 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2665 jio_fprintf(defaultStream::error_stream(),
2666 "Please use -XX:OldPLABSize in place of "
2667 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2668 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2669 julong young_plab_size = 0;
2670 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2671 if (errcode != arg_in_range) {
2672 jio_fprintf(defaultStream::error_stream(),
2673 "Invalid young PLAB size: %s\n", option->optionString);
2674 describe_range_error(errcode);
2675 return JNI_EINVAL;
2676 }
2677 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2678 jio_fprintf(defaultStream::error_stream(),
2679 "Please use -XX:YoungPLABSize in place of "
2680 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2681 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2682 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2683 julong stack_size = 0;
2684 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2685 if (errcode != arg_in_range) {
2686 jio_fprintf(defaultStream::error_stream(),
2687 "Invalid mark stack size: %s\n", option->optionString);
2688 describe_range_error(errcode);
2689 return JNI_EINVAL;
2690 }
2691 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2692 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2693 julong max_stack_size = 0;
2694 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2695 if (errcode != arg_in_range) {
2696 jio_fprintf(defaultStream::error_stream(),
2697 "Invalid maximum mark stack size: %s\n",
2698 option->optionString);
2699 describe_range_error(errcode);
2700 return JNI_EINVAL;
2701 }
2702 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2703 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2704 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2705 uintx conc_threads = 0;
2706 if (!parse_uintx(tail, &conc_threads, 1)) {
2707 jio_fprintf(defaultStream::error_stream(),
2708 "Invalid concurrent threads: %s\n", option->optionString);
2709 return JNI_EINVAL;
2710 }
2711 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2712 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2713 julong max_direct_memory_size = 0;
2714 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2715 if (errcode != arg_in_range) {
2716 jio_fprintf(defaultStream::error_stream(),
2717 "Invalid maximum direct memory size: %s\n",
2718 option->optionString);
2719 describe_range_error(errcode);
2720 return JNI_EINVAL;
2721 }
2722 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2723 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2724 // Skip -XX:Flags= since that case has already been handled
2725 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2726 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2727 return JNI_EINVAL;
2728 }
2729 }
2730 // Unknown option
2731 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2732 return JNI_ERR;
2733 }
2734 }
2736 // Change the default value for flags which have different default values
2737 // when working with older JDKs.
2738 if (JDK_Version::current().compare_major(6) <= 0 &&
2739 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2740 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2741 }
2742 #ifdef LINUX
2743 if (JDK_Version::current().compare_major(6) <= 0 &&
2744 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2745 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2746 }
2747 #endif // LINUX
2748 return JNI_OK;
2749 }
2751 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2752 // This must be done after all -D arguments have been processed.
2753 scp_p->expand_endorsed();
2755 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2756 // Assemble the bootclasspath elements into the final path.
2757 Arguments::set_sysclasspath(scp_p->combined_path());
2758 }
2760 // This must be done after all arguments have been processed.
2761 // java_compiler() true means set to "NONE" or empty.
2762 if (java_compiler() && !xdebug_mode()) {
2763 // For backwards compatibility, we switch to interpreted mode if
2764 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2765 // not specified.
2766 set_mode_flags(_int);
2767 }
2768 if (CompileThreshold == 0) {
2769 set_mode_flags(_int);
2770 }
2772 #ifndef COMPILER2
2773 // Don't degrade server performance for footprint
2774 if (FLAG_IS_DEFAULT(UseLargePages) &&
2775 MaxHeapSize < LargePageHeapSizeThreshold) {
2776 // No need for large granularity pages w/small heaps.
2777 // Note that large pages are enabled/disabled for both the
2778 // Java heap and the code cache.
2779 FLAG_SET_DEFAULT(UseLargePages, false);
2780 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2781 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2782 }
2784 // Tiered compilation is undefined with C1.
2785 TieredCompilation = false;
2786 #else
2787 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2788 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2789 }
2790 #endif
2792 // If we are running in a headless jre, force java.awt.headless property
2793 // to be true unless the property has already been set.
2794 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2795 if (os::is_headless_jre()) {
2796 const char* headless = Arguments::get_property("java.awt.headless");
2797 if (headless == NULL) {
2798 char envbuffer[128];
2799 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2800 if (!add_property("java.awt.headless=true")) {
2801 return JNI_ENOMEM;
2802 }
2803 } else {
2804 char buffer[256];
2805 strcpy(buffer, "java.awt.headless=");
2806 strcat(buffer, envbuffer);
2807 if (!add_property(buffer)) {
2808 return JNI_ENOMEM;
2809 }
2810 }
2811 }
2812 }
2814 if (!check_vm_args_consistency()) {
2815 return JNI_ERR;
2816 }
2818 return JNI_OK;
2819 }
2821 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2822 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2823 scp_assembly_required_p);
2824 }
2826 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2827 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2828 scp_assembly_required_p);
2829 }
2831 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2832 const int N_MAX_OPTIONS = 64;
2833 const int OPTION_BUFFER_SIZE = 1024;
2834 char buffer[OPTION_BUFFER_SIZE];
2836 // The variable will be ignored if it exceeds the length of the buffer.
2837 // Don't check this variable if user has special privileges
2838 // (e.g. unix su command).
2839 if (os::getenv(name, buffer, sizeof(buffer)) &&
2840 !os::have_special_privileges()) {
2841 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Picked up %s: %s\n", name, buffer);
2844 char* rd = buffer; // pointer to the input string (rd)
2845 int i;
2846 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2847 while (isspace(*rd)) rd++; // skip whitespace
2848 if (*rd == 0) break; // we re done when the input string is read completely
2850 // The output, option string, overwrites the input string.
2851 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2852 // input string (rd).
2853 char* wrt = rd;
2855 options[i++].optionString = wrt; // Fill in option
2856 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2857 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2858 int quote = *rd; // matching quote to look for
2859 rd++; // don't copy open quote
2860 while (*rd != quote) { // include everything (even spaces) up until quote
2861 if (*rd == 0) { // string termination means unmatched string
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Unmatched quote in %s\n", name);
2864 return JNI_ERR;
2865 }
2866 *wrt++ = *rd++; // copy to option string
2867 }
2868 rd++; // don't copy close quote
2869 } else {
2870 *wrt++ = *rd++; // copy to option string
2871 }
2872 }
2873 // Need to check if we're done before writing a NULL,
2874 // because the write could be to the byte that rd is pointing to.
2875 if (*rd++ == 0) {
2876 *wrt = 0;
2877 break;
2878 }
2879 *wrt = 0; // Zero terminate option
2880 }
2881 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2882 JavaVMInitArgs vm_args;
2883 vm_args.version = JNI_VERSION_1_2;
2884 vm_args.options = options;
2885 vm_args.nOptions = i;
2886 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2888 if (PrintVMOptions) {
2889 const char* tail;
2890 for (int i = 0; i < vm_args.nOptions; i++) {
2891 const JavaVMOption *option = vm_args.options + i;
2892 if (match_option(option, "-XX:", &tail)) {
2893 logOption(tail);
2894 }
2895 }
2896 }
2898 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2899 }
2900 return JNI_OK;
2901 }
2903 void Arguments::set_shared_spaces_flags() {
2904 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2905 const bool might_share = must_share || UseSharedSpaces;
2907 // The string table is part of the shared archive so the size must match.
2908 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2909 // Disable sharing.
2910 if (must_share) {
2911 warning("disabling shared archive %s because of non-default "
2912 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2913 }
2914 if (might_share) {
2915 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2916 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2917 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2918 }
2919 return;
2920 }
2922 // Check whether class data sharing settings conflict with GC, compressed oops
2923 // or page size, and fix them up. Explicit sharing options override other
2924 // settings.
2925 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2926 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2927 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2928 if (cannot_share) {
2929 if (must_share) {
2930 warning("selecting serial gc and disabling large pages %s"
2931 "because of %s", "" LP64_ONLY("and compressed oops "),
2932 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2933 force_serial_gc();
2934 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2935 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2936 } else {
2937 if (UseSharedSpaces && Verbose) {
2938 warning("turning off use of shared archive because of "
2939 "choice of garbage collector or large pages");
2940 }
2941 no_shared_spaces();
2942 }
2943 } else if (UseLargePages && might_share) {
2944 // Disable large pages to allow shared spaces. This is sub-optimal, since
2945 // there may not even be a shared archive to use.
2946 FLAG_SET_DEFAULT(UseLargePages, false);
2947 }
2948 }
2950 // Disable options not supported in this release, with a warning if they
2951 // were explicitly requested on the command-line
2952 #define UNSUPPORTED_OPTION(opt, description) \
2953 do { \
2954 if (opt) { \
2955 if (FLAG_IS_CMDLINE(opt)) { \
2956 warning(description " is disabled in this release."); \
2957 } \
2958 FLAG_SET_DEFAULT(opt, false); \
2959 } \
2960 } while(0)
2962 // Parse entry point called from JNI_CreateJavaVM
2964 jint Arguments::parse(const JavaVMInitArgs* args) {
2966 // Sharing support
2967 // Construct the path to the archive
2968 char jvm_path[JVM_MAXPATHLEN];
2969 os::jvm_path(jvm_path, sizeof(jvm_path));
2970 char *end = strrchr(jvm_path, *os::file_separator());
2971 if (end != NULL) *end = '\0';
2972 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2973 strlen(os::file_separator()) + 20, mtInternal);
2974 if (shared_archive_path == NULL) return JNI_ENOMEM;
2975 strcpy(shared_archive_path, jvm_path);
2976 strcat(shared_archive_path, os::file_separator());
2977 strcat(shared_archive_path, "classes");
2978 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2979 strcat(shared_archive_path, ".jsa");
2980 SharedArchivePath = shared_archive_path;
2982 // Remaining part of option string
2983 const char* tail;
2985 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2986 const char* hotspotrc = ".hotspotrc";
2987 bool settings_file_specified = false;
2988 bool needs_hotspotrc_warning = false;
2990 const char* flags_file;
2991 int index;
2992 for (index = 0; index < args->nOptions; index++) {
2993 const JavaVMOption *option = args->options + index;
2994 if (match_option(option, "-XX:Flags=", &tail)) {
2995 flags_file = tail;
2996 settings_file_specified = true;
2997 }
2998 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2999 PrintVMOptions = true;
3000 }
3001 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3002 PrintVMOptions = false;
3003 }
3004 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3005 IgnoreUnrecognizedVMOptions = true;
3006 }
3007 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3008 IgnoreUnrecognizedVMOptions = false;
3009 }
3010 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3011 CommandLineFlags::printFlags(tty, false);
3012 vm_exit(0);
3013 }
3014 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3015 MemTracker::init_tracking_options(tail);
3016 }
3019 #ifndef PRODUCT
3020 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3021 CommandLineFlags::printFlags(tty, true);
3022 vm_exit(0);
3023 }
3024 #endif
3025 }
3027 if (IgnoreUnrecognizedVMOptions) {
3028 // uncast const to modify the flag args->ignoreUnrecognized
3029 *(jboolean*)(&args->ignoreUnrecognized) = true;
3030 }
3032 // Parse specified settings file
3033 if (settings_file_specified) {
3034 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3035 return JNI_EINVAL;
3036 }
3037 } else {
3038 #ifdef ASSERT
3039 // Parse default .hotspotrc settings file
3040 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3041 return JNI_EINVAL;
3042 }
3043 #else
3044 struct stat buf;
3045 if (os::stat(hotspotrc, &buf) == 0) {
3046 needs_hotspotrc_warning = true;
3047 }
3048 #endif
3049 }
3051 if (PrintVMOptions) {
3052 for (index = 0; index < args->nOptions; index++) {
3053 const JavaVMOption *option = args->options + index;
3054 if (match_option(option, "-XX:", &tail)) {
3055 logOption(tail);
3056 }
3057 }
3058 }
3060 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3061 jint result = parse_vm_init_args(args);
3062 if (result != JNI_OK) {
3063 return result;
3064 }
3066 // Delay warning until here so that we've had a chance to process
3067 // the -XX:-PrintWarnings flag
3068 if (needs_hotspotrc_warning) {
3069 warning("%s file is present but has been ignored. "
3070 "Run with -XX:Flags=%s to load the file.",
3071 hotspotrc, hotspotrc);
3072 }
3074 #if (defined JAVASE_EMBEDDED || defined ARM)
3075 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3076 #endif
3078 #ifndef PRODUCT
3079 if (TraceBytecodesAt != 0) {
3080 TraceBytecodes = true;
3081 }
3082 if (CountCompiledCalls) {
3083 if (UseCounterDecay) {
3084 warning("UseCounterDecay disabled because CountCalls is set");
3085 UseCounterDecay = false;
3086 }
3087 }
3088 #endif // PRODUCT
3090 // Transitional
3091 if (EnableMethodHandles || AnonymousClasses) {
3092 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3093 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
3094 } else {
3095 EnableInvokeDynamic = true;
3096 }
3097 }
3099 // JSR 292 is not supported before 1.7
3100 if (!JDK_Version::is_gte_jdk17x_version()) {
3101 if (EnableInvokeDynamic) {
3102 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3103 warning("JSR 292 is not supported before 1.7. Disabling support.");
3104 }
3105 EnableInvokeDynamic = false;
3106 }
3107 }
3109 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3110 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3111 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3112 }
3113 ScavengeRootsInCode = 1;
3114 }
3115 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3116 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3117 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3118 }
3119 ScavengeRootsInCode = 1;
3120 }
3122 if (PrintGCDetails) {
3123 // Turn on -verbose:gc options as well
3124 PrintGC = true;
3125 }
3127 if (!JDK_Version::is_gte_jdk18x_version()) {
3128 // To avoid changing the log format for 7 updates this flag is only
3129 // true by default in JDK8 and above.
3130 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3131 FLAG_SET_DEFAULT(PrintGCCause, false);
3132 }
3133 }
3135 // Set object alignment values.
3136 set_object_alignment();
3138 #ifdef SERIALGC
3139 force_serial_gc();
3140 #endif // SERIALGC
3141 #ifdef KERNEL
3142 no_shared_spaces();
3143 #endif // KERNEL
3145 // Set flags based on ergonomics.
3146 set_ergonomics_flags();
3148 set_shared_spaces_flags();
3150 // Check the GC selections again.
3151 if (!check_gc_consistency()) {
3152 return JNI_EINVAL;
3153 }
3155 if (TieredCompilation) {
3156 set_tiered_flags();
3157 } else {
3158 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3159 if (CompilationPolicyChoice >= 2) {
3160 vm_exit_during_initialization(
3161 "Incompatible compilation policy selected", NULL);
3162 }
3163 }
3165 #ifndef KERNEL
3166 // Set heap size based on available physical memory
3167 set_heap_size();
3168 // Set per-collector flags
3169 if (UseParallelGC || UseParallelOldGC) {
3170 set_parallel_gc_flags();
3171 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3172 set_cms_and_parnew_gc_flags();
3173 } else if (UseParNewGC) { // skipped if CMS is set above
3174 set_parnew_gc_flags();
3175 } else if (UseG1GC) {
3176 set_g1_gc_flags();
3177 }
3178 #endif // KERNEL
3180 #ifdef SERIALGC
3181 assert(verify_serial_gc_flags(), "SerialGC unset");
3182 #endif // SERIALGC
3184 // Set bytecode rewriting flags
3185 set_bytecode_flags();
3187 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3188 set_aggressive_opts_flags();
3190 // Turn off biased locking for locking debug mode flags,
3191 // which are subtlely different from each other but neither works with
3192 // biased locking.
3193 if (UseHeavyMonitors
3194 #ifdef COMPILER1
3195 || !UseFastLocking
3196 #endif // COMPILER1
3197 ) {
3198 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3199 // flag set to true on command line; warn the user that they
3200 // can't enable biased locking here
3201 warning("Biased Locking is not supported with locking debug flags"
3202 "; ignoring UseBiasedLocking flag." );
3203 }
3204 UseBiasedLocking = false;
3205 }
3207 #ifdef CC_INTERP
3208 // Clear flags not supported by the C++ interpreter
3209 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3210 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3211 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3212 #endif // CC_INTERP
3214 #ifdef COMPILER2
3215 if (!UseBiasedLocking || EmitSync != 0) {
3216 UseOptoBiasInlining = false;
3217 }
3218 if (!EliminateLocks) {
3219 EliminateNestedLocks = false;
3220 }
3221 #endif
3223 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3224 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3225 DebugNonSafepoints = true;
3226 }
3228 #ifndef PRODUCT
3229 if (CompileTheWorld) {
3230 // Force NmethodSweeper to sweep whole CodeCache each time.
3231 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3232 NmethodSweepFraction = 1;
3233 }
3234 }
3235 #endif
3237 if (PrintCommandLineFlags) {
3238 CommandLineFlags::printSetFlags(tty);
3239 }
3241 // Apply CPU specific policy for the BiasedLocking
3242 if (UseBiasedLocking) {
3243 if (!VM_Version::use_biased_locking() &&
3244 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3245 UseBiasedLocking = false;
3246 }
3247 }
3249 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3250 // but only if not already set on the commandline
3251 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3252 bool set = false;
3253 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3254 if (!set) {
3255 FLAG_SET_DEFAULT(PauseAtExit, true);
3256 }
3257 }
3259 return JNI_OK;
3260 }
3262 int Arguments::PropertyList_count(SystemProperty* pl) {
3263 int count = 0;
3264 while(pl != NULL) {
3265 count++;
3266 pl = pl->next();
3267 }
3268 return count;
3269 }
3271 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3272 assert(key != NULL, "just checking");
3273 SystemProperty* prop;
3274 for (prop = pl; prop != NULL; prop = prop->next()) {
3275 if (strcmp(key, prop->key()) == 0) return prop->value();
3276 }
3277 return NULL;
3278 }
3280 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3281 int count = 0;
3282 const char* ret_val = NULL;
3284 while(pl != NULL) {
3285 if(count >= index) {
3286 ret_val = pl->key();
3287 break;
3288 }
3289 count++;
3290 pl = pl->next();
3291 }
3293 return ret_val;
3294 }
3296 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3297 int count = 0;
3298 char* ret_val = NULL;
3300 while(pl != NULL) {
3301 if(count >= index) {
3302 ret_val = pl->value();
3303 break;
3304 }
3305 count++;
3306 pl = pl->next();
3307 }
3309 return ret_val;
3310 }
3312 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3313 SystemProperty* p = *plist;
3314 if (p == NULL) {
3315 *plist = new_p;
3316 } else {
3317 while (p->next() != NULL) {
3318 p = p->next();
3319 }
3320 p->set_next(new_p);
3321 }
3322 }
3324 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3325 if (plist == NULL)
3326 return;
3328 SystemProperty* new_p = new SystemProperty(k, v, true);
3329 PropertyList_add(plist, new_p);
3330 }
3332 // This add maintains unique property key in the list.
3333 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3334 if (plist == NULL)
3335 return;
3337 // If property key exist then update with new value.
3338 SystemProperty* prop;
3339 for (prop = *plist; prop != NULL; prop = prop->next()) {
3340 if (strcmp(k, prop->key()) == 0) {
3341 if (append) {
3342 prop->append_value(v);
3343 } else {
3344 prop->set_value(v);
3345 }
3346 return;
3347 }
3348 }
3350 PropertyList_add(plist, k, v);
3351 }
3353 #ifdef KERNEL
3354 char *Arguments::get_kernel_properties() {
3355 // Find properties starting with kernel and append them to string
3356 // We need to find out how long they are first because the URL's that they
3357 // might point to could get long.
3358 int length = 0;
3359 SystemProperty* prop;
3360 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3361 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3362 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3363 }
3364 }
3365 // Add one for null terminator.
3366 char *props = AllocateHeap(length + 1, mtInternal);
3367 if (length != 0) {
3368 int pos = 0;
3369 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3370 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3371 jio_snprintf(&props[pos], length-pos,
3372 "-D%s=%s ", prop->key(), prop->value());
3373 pos = strlen(props);
3374 }
3375 }
3376 }
3377 // null terminate props in case of null
3378 props[length] = '\0';
3379 return props;
3380 }
3381 #endif // KERNEL
3383 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3384 // Returns true if all of the source pointed by src has been copied over to
3385 // the destination buffer pointed by buf. Otherwise, returns false.
3386 // Notes:
3387 // 1. If the length (buflen) of the destination buffer excluding the
3388 // NULL terminator character is not long enough for holding the expanded
3389 // pid characters, it also returns false instead of returning the partially
3390 // expanded one.
3391 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3392 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3393 char* buf, size_t buflen) {
3394 const char* p = src;
3395 char* b = buf;
3396 const char* src_end = &src[srclen];
3397 char* buf_end = &buf[buflen - 1];
3399 while (p < src_end && b < buf_end) {
3400 if (*p == '%') {
3401 switch (*(++p)) {
3402 case '%': // "%%" ==> "%"
3403 *b++ = *p++;
3404 break;
3405 case 'p': { // "%p" ==> current process id
3406 // buf_end points to the character before the last character so
3407 // that we could write '\0' to the end of the buffer.
3408 size_t buf_sz = buf_end - b + 1;
3409 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3411 // if jio_snprintf fails or the buffer is not long enough to hold
3412 // the expanded pid, returns false.
3413 if (ret < 0 || ret >= (int)buf_sz) {
3414 return false;
3415 } else {
3416 b += ret;
3417 assert(*b == '\0', "fail in copy_expand_pid");
3418 if (p == src_end && b == buf_end + 1) {
3419 // reach the end of the buffer.
3420 return true;
3421 }
3422 }
3423 p++;
3424 break;
3425 }
3426 default :
3427 *b++ = '%';
3428 }
3429 } else {
3430 *b++ = *p++;
3431 }
3432 }
3433 *b = '\0';
3434 return (p == src_end); // return false if not all of the source was copied
3435 }