Mon, 13 Jun 2011 09:58:16 -0700
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
Summary: It turns out that there is no need to explicitly stop CMS since the JVM is taken down at a terminal safepoint during which CMS threads are (terminally) inactive. This will need to be revised if and when we evolve in the future to a point where we allow JVM reincarnation in the same process, but those changes will be much more sweeping than just terminating CMS threads. The unused ::stop() methods will be removed in a separate CR. Also include in this CR is the fix for a small typo in the spelling of UseGCLogFileRotation in a message in arguments.cpp, brought to our attention by Rainer Jung and reviewed by minqi.
Reviewed-by: johnc, jwilhelm
1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "compiler/compilerOracle.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/cardTableRS.hpp"
30 #include "memory/referenceProcessor.hpp"
31 #include "memory/universe.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/jvmtiExport.hpp"
34 #include "runtime/arguments.hpp"
35 #include "runtime/globals_extension.hpp"
36 #include "runtime/java.hpp"
37 #include "services/management.hpp"
38 #include "utilities/defaultStream.hpp"
39 #include "utilities/taskqueue.hpp"
40 #ifdef TARGET_ARCH_x86
41 # include "vm_version_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "vm_version_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "vm_version_zero.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_linux
50 # include "os_linux.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_solaris
53 # include "os_solaris.inline.hpp"
54 #endif
55 #ifdef TARGET_OS_FAMILY_windows
56 # include "os_windows.inline.hpp"
57 #endif
58 #ifndef SERIALGC
59 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
60 #endif
62 // Note: This is a special bug reporting site for the JVM
63 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
64 #define DEFAULT_JAVA_LAUNCHER "generic"
66 char** Arguments::_jvm_flags_array = NULL;
67 int Arguments::_num_jvm_flags = 0;
68 char** Arguments::_jvm_args_array = NULL;
69 int Arguments::_num_jvm_args = 0;
70 char* Arguments::_java_command = NULL;
71 SystemProperty* Arguments::_system_properties = NULL;
72 const char* Arguments::_gc_log_filename = NULL;
73 bool Arguments::_has_profile = false;
74 bool Arguments::_has_alloc_profile = false;
75 uintx Arguments::_min_heap_size = 0;
76 Arguments::Mode Arguments::_mode = _mixed;
77 bool Arguments::_java_compiler = false;
78 bool Arguments::_xdebug_mode = false;
79 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
80 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
81 int Arguments::_sun_java_launcher_pid = -1;
82 bool Arguments::_created_by_gamma_launcher = false;
84 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
85 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
86 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
87 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
88 bool Arguments::_ClipInlining = ClipInlining;
90 char* Arguments::SharedArchivePath = NULL;
92 AgentLibraryList Arguments::_libraryList;
93 AgentLibraryList Arguments::_agentList;
95 abort_hook_t Arguments::_abort_hook = NULL;
96 exit_hook_t Arguments::_exit_hook = NULL;
97 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
100 SystemProperty *Arguments::_java_ext_dirs = NULL;
101 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
102 SystemProperty *Arguments::_sun_boot_library_path = NULL;
103 SystemProperty *Arguments::_java_library_path = NULL;
104 SystemProperty *Arguments::_java_home = NULL;
105 SystemProperty *Arguments::_java_class_path = NULL;
106 SystemProperty *Arguments::_sun_boot_class_path = NULL;
108 char* Arguments::_meta_index_path = NULL;
109 char* Arguments::_meta_index_dir = NULL;
111 static bool force_client_mode = false;
113 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
115 static bool match_option(const JavaVMOption *option, const char* name,
116 const char** tail) {
117 int len = (int)strlen(name);
118 if (strncmp(option->optionString, name, len) == 0) {
119 *tail = option->optionString + len;
120 return true;
121 } else {
122 return false;
123 }
124 }
126 static void logOption(const char* opt) {
127 if (PrintVMOptions) {
128 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
129 }
130 }
132 // Process java launcher properties.
133 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
134 // See if sun.java.launcher or sun.java.launcher.pid is defined.
135 // Must do this before setting up other system properties,
136 // as some of them may depend on launcher type.
137 for (int index = 0; index < args->nOptions; index++) {
138 const JavaVMOption* option = args->options + index;
139 const char* tail;
141 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
142 process_java_launcher_argument(tail, option->extraInfo);
143 continue;
144 }
145 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
146 _sun_java_launcher_pid = atoi(tail);
147 continue;
148 }
149 }
150 }
152 // Initialize system properties key and value.
153 void Arguments::init_system_properties() {
155 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
156 "Java Virtual Machine Specification", false));
157 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
158 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
159 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
161 // following are JVMTI agent writeable properties.
162 // Properties values are set to NULL and they are
163 // os specific they are initialized in os::init_system_properties_values().
164 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
165 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
166 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
167 _java_library_path = new SystemProperty("java.library.path", NULL, true);
168 _java_home = new SystemProperty("java.home", NULL, true);
169 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
171 _java_class_path = new SystemProperty("java.class.path", "", true);
173 // Add to System Property list.
174 PropertyList_add(&_system_properties, _java_ext_dirs);
175 PropertyList_add(&_system_properties, _java_endorsed_dirs);
176 PropertyList_add(&_system_properties, _sun_boot_library_path);
177 PropertyList_add(&_system_properties, _java_library_path);
178 PropertyList_add(&_system_properties, _java_home);
179 PropertyList_add(&_system_properties, _java_class_path);
180 PropertyList_add(&_system_properties, _sun_boot_class_path);
182 // Set OS specific system properties values
183 os::init_system_properties_values();
184 }
187 // Update/Initialize System properties after JDK version number is known
188 void Arguments::init_version_specific_system_properties() {
189 enum { bufsz = 16 };
190 char buffer[bufsz];
191 const char* spec_vendor = "Sun Microsystems Inc.";
192 uint32_t spec_version = 0;
194 if (JDK_Version::is_gte_jdk17x_version()) {
195 spec_vendor = "Oracle Corporation";
196 spec_version = JDK_Version::current().major_version();
197 }
198 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
200 PropertyList_add(&_system_properties,
201 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
202 PropertyList_add(&_system_properties,
203 new SystemProperty("java.vm.specification.version", buffer, false));
204 PropertyList_add(&_system_properties,
205 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
206 }
208 /**
209 * Provide a slightly more user-friendly way of eliminating -XX flags.
210 * When a flag is eliminated, it can be added to this list in order to
211 * continue accepting this flag on the command-line, while issuing a warning
212 * and ignoring the value. Once the JDK version reaches the 'accept_until'
213 * limit, we flatly refuse to admit the existence of the flag. This allows
214 * a flag to die correctly over JDK releases using HSX.
215 */
216 typedef struct {
217 const char* name;
218 JDK_Version obsoleted_in; // when the flag went away
219 JDK_Version accept_until; // which version to start denying the existence
220 } ObsoleteFlag;
222 static ObsoleteFlag obsolete_jvm_flags[] = {
223 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
232 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
233 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
234 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
235 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
236 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
237 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
238 { "DefaultInitialRAMFraction",
239 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
240 { "UseDepthFirstScavengeOrder",
241 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
242 { "HandlePromotionFailure",
243 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
244 { "MaxLiveObjectEvacuationRatio",
245 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
246 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
247 { "UseParallelOldGCCompacting",
248 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
249 { "UseParallelDensePrefixUpdate",
250 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
251 { "UseParallelOldGCDensePrefix",
252 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
253 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
254 { NULL, JDK_Version(0), JDK_Version(0) }
255 };
257 // Returns true if the flag is obsolete and fits into the range specified
258 // for being ignored. In the case that the flag is ignored, the 'version'
259 // value is filled in with the version number when the flag became
260 // obsolete so that that value can be displayed to the user.
261 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
262 int i = 0;
263 assert(version != NULL, "Must provide a version buffer");
264 while (obsolete_jvm_flags[i].name != NULL) {
265 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
266 // <flag>=xxx form
267 // [-|+]<flag> form
268 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
269 ((s[0] == '+' || s[0] == '-') &&
270 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
271 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
272 *version = flag_status.obsoleted_in;
273 return true;
274 }
275 }
276 i++;
277 }
278 return false;
279 }
281 // Constructs the system class path (aka boot class path) from the following
282 // components, in order:
283 //
284 // prefix // from -Xbootclasspath/p:...
285 // endorsed // the expansion of -Djava.endorsed.dirs=...
286 // base // from os::get_system_properties() or -Xbootclasspath=
287 // suffix // from -Xbootclasspath/a:...
288 //
289 // java.endorsed.dirs is a list of directories; any jar or zip files in the
290 // directories are added to the sysclasspath just before the base.
291 //
292 // This could be AllStatic, but it isn't needed after argument processing is
293 // complete.
294 class SysClassPath: public StackObj {
295 public:
296 SysClassPath(const char* base);
297 ~SysClassPath();
299 inline void set_base(const char* base);
300 inline void add_prefix(const char* prefix);
301 inline void add_suffix_to_prefix(const char* suffix);
302 inline void add_suffix(const char* suffix);
303 inline void reset_path(const char* base);
305 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
306 // property. Must be called after all command-line arguments have been
307 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
308 // combined_path().
309 void expand_endorsed();
311 inline const char* get_base() const { return _items[_scp_base]; }
312 inline const char* get_prefix() const { return _items[_scp_prefix]; }
313 inline const char* get_suffix() const { return _items[_scp_suffix]; }
314 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
316 // Combine all the components into a single c-heap-allocated string; caller
317 // must free the string if/when no longer needed.
318 char* combined_path();
320 private:
321 // Utility routines.
322 static char* add_to_path(const char* path, const char* str, bool prepend);
323 static char* add_jars_to_path(char* path, const char* directory);
325 inline void reset_item_at(int index);
327 // Array indices for the items that make up the sysclasspath. All except the
328 // base are allocated in the C heap and freed by this class.
329 enum {
330 _scp_prefix, // from -Xbootclasspath/p:...
331 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
332 _scp_base, // the default sysclasspath
333 _scp_suffix, // from -Xbootclasspath/a:...
334 _scp_nitems // the number of items, must be last.
335 };
337 const char* _items[_scp_nitems];
338 DEBUG_ONLY(bool _expansion_done;)
339 };
341 SysClassPath::SysClassPath(const char* base) {
342 memset(_items, 0, sizeof(_items));
343 _items[_scp_base] = base;
344 DEBUG_ONLY(_expansion_done = false;)
345 }
347 SysClassPath::~SysClassPath() {
348 // Free everything except the base.
349 for (int i = 0; i < _scp_nitems; ++i) {
350 if (i != _scp_base) reset_item_at(i);
351 }
352 DEBUG_ONLY(_expansion_done = false;)
353 }
355 inline void SysClassPath::set_base(const char* base) {
356 _items[_scp_base] = base;
357 }
359 inline void SysClassPath::add_prefix(const char* prefix) {
360 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
361 }
363 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
364 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
365 }
367 inline void SysClassPath::add_suffix(const char* suffix) {
368 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
369 }
371 inline void SysClassPath::reset_item_at(int index) {
372 assert(index < _scp_nitems && index != _scp_base, "just checking");
373 if (_items[index] != NULL) {
374 FREE_C_HEAP_ARRAY(char, _items[index]);
375 _items[index] = NULL;
376 }
377 }
379 inline void SysClassPath::reset_path(const char* base) {
380 // Clear the prefix and suffix.
381 reset_item_at(_scp_prefix);
382 reset_item_at(_scp_suffix);
383 set_base(base);
384 }
386 //------------------------------------------------------------------------------
388 void SysClassPath::expand_endorsed() {
389 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
391 const char* path = Arguments::get_property("java.endorsed.dirs");
392 if (path == NULL) {
393 path = Arguments::get_endorsed_dir();
394 assert(path != NULL, "no default for java.endorsed.dirs");
395 }
397 char* expanded_path = NULL;
398 const char separator = *os::path_separator();
399 const char* const end = path + strlen(path);
400 while (path < end) {
401 const char* tmp_end = strchr(path, separator);
402 if (tmp_end == NULL) {
403 expanded_path = add_jars_to_path(expanded_path, path);
404 path = end;
405 } else {
406 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
407 memcpy(dirpath, path, tmp_end - path);
408 dirpath[tmp_end - path] = '\0';
409 expanded_path = add_jars_to_path(expanded_path, dirpath);
410 FREE_C_HEAP_ARRAY(char, dirpath);
411 path = tmp_end + 1;
412 }
413 }
414 _items[_scp_endorsed] = expanded_path;
415 DEBUG_ONLY(_expansion_done = true;)
416 }
418 // Combine the bootclasspath elements, some of which may be null, into a single
419 // c-heap-allocated string.
420 char* SysClassPath::combined_path() {
421 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
422 assert(_expansion_done, "must call expand_endorsed() first.");
424 size_t lengths[_scp_nitems];
425 size_t total_len = 0;
427 const char separator = *os::path_separator();
429 // Get the lengths.
430 int i;
431 for (i = 0; i < _scp_nitems; ++i) {
432 if (_items[i] != NULL) {
433 lengths[i] = strlen(_items[i]);
434 // Include space for the separator char (or a NULL for the last item).
435 total_len += lengths[i] + 1;
436 }
437 }
438 assert(total_len > 0, "empty sysclasspath not allowed");
440 // Copy the _items to a single string.
441 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
442 char* cp_tmp = cp;
443 for (i = 0; i < _scp_nitems; ++i) {
444 if (_items[i] != NULL) {
445 memcpy(cp_tmp, _items[i], lengths[i]);
446 cp_tmp += lengths[i];
447 *cp_tmp++ = separator;
448 }
449 }
450 *--cp_tmp = '\0'; // Replace the extra separator.
451 return cp;
452 }
454 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
455 char*
456 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
457 char *cp;
459 assert(str != NULL, "just checking");
460 if (path == NULL) {
461 size_t len = strlen(str) + 1;
462 cp = NEW_C_HEAP_ARRAY(char, len);
463 memcpy(cp, str, len); // copy the trailing null
464 } else {
465 const char separator = *os::path_separator();
466 size_t old_len = strlen(path);
467 size_t str_len = strlen(str);
468 size_t len = old_len + str_len + 2;
470 if (prepend) {
471 cp = NEW_C_HEAP_ARRAY(char, len);
472 char* cp_tmp = cp;
473 memcpy(cp_tmp, str, str_len);
474 cp_tmp += str_len;
475 *cp_tmp = separator;
476 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
477 FREE_C_HEAP_ARRAY(char, path);
478 } else {
479 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
480 char* cp_tmp = cp + old_len;
481 *cp_tmp = separator;
482 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
483 }
484 }
485 return cp;
486 }
488 // Scan the directory and append any jar or zip files found to path.
489 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
490 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
491 DIR* dir = os::opendir(directory);
492 if (dir == NULL) return path;
494 char dir_sep[2] = { '\0', '\0' };
495 size_t directory_len = strlen(directory);
496 const char fileSep = *os::file_separator();
497 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
499 /* Scan the directory for jars/zips, appending them to path. */
500 struct dirent *entry;
501 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
502 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
503 const char* name = entry->d_name;
504 const char* ext = name + strlen(name) - 4;
505 bool isJarOrZip = ext > name &&
506 (os::file_name_strcmp(ext, ".jar") == 0 ||
507 os::file_name_strcmp(ext, ".zip") == 0);
508 if (isJarOrZip) {
509 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
510 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
511 path = add_to_path(path, jarpath, false);
512 FREE_C_HEAP_ARRAY(char, jarpath);
513 }
514 }
515 FREE_C_HEAP_ARRAY(char, dbuf);
516 os::closedir(dir);
517 return path;
518 }
520 // Parses a memory size specification string.
521 static bool atomull(const char *s, julong* result) {
522 julong n = 0;
523 int args_read = sscanf(s, os::julong_format_specifier(), &n);
524 if (args_read != 1) {
525 return false;
526 }
527 while (*s != '\0' && isdigit(*s)) {
528 s++;
529 }
530 // 4705540: illegal if more characters are found after the first non-digit
531 if (strlen(s) > 1) {
532 return false;
533 }
534 switch (*s) {
535 case 'T': case 't':
536 *result = n * G * K;
537 // Check for overflow.
538 if (*result/((julong)G * K) != n) return false;
539 return true;
540 case 'G': case 'g':
541 *result = n * G;
542 if (*result/G != n) return false;
543 return true;
544 case 'M': case 'm':
545 *result = n * M;
546 if (*result/M != n) return false;
547 return true;
548 case 'K': case 'k':
549 *result = n * K;
550 if (*result/K != n) return false;
551 return true;
552 case '\0':
553 *result = n;
554 return true;
555 default:
556 return false;
557 }
558 }
560 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
561 if (size < min_size) return arg_too_small;
562 // Check that size will fit in a size_t (only relevant on 32-bit)
563 if (size > max_uintx) return arg_too_big;
564 return arg_in_range;
565 }
567 // Describe an argument out of range error
568 void Arguments::describe_range_error(ArgsRange errcode) {
569 switch(errcode) {
570 case arg_too_big:
571 jio_fprintf(defaultStream::error_stream(),
572 "The specified size exceeds the maximum "
573 "representable size.\n");
574 break;
575 case arg_too_small:
576 case arg_unreadable:
577 case arg_in_range:
578 // do nothing for now
579 break;
580 default:
581 ShouldNotReachHere();
582 }
583 }
585 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
586 return CommandLineFlags::boolAtPut(name, &value, origin);
587 }
589 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
590 double v;
591 if (sscanf(value, "%lf", &v) != 1) {
592 return false;
593 }
595 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
596 return true;
597 }
598 return false;
599 }
601 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
602 julong v;
603 intx intx_v;
604 bool is_neg = false;
605 // Check the sign first since atomull() parses only unsigned values.
606 if (*value == '-') {
607 if (!CommandLineFlags::intxAt(name, &intx_v)) {
608 return false;
609 }
610 value++;
611 is_neg = true;
612 }
613 if (!atomull(value, &v)) {
614 return false;
615 }
616 intx_v = (intx) v;
617 if (is_neg) {
618 intx_v = -intx_v;
619 }
620 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
621 return true;
622 }
623 uintx uintx_v = (uintx) v;
624 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
625 return true;
626 }
627 uint64_t uint64_t_v = (uint64_t) v;
628 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
629 return true;
630 }
631 return false;
632 }
634 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
635 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
636 // Contract: CommandLineFlags always returns a pointer that needs freeing.
637 FREE_C_HEAP_ARRAY(char, value);
638 return true;
639 }
641 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
642 const char* old_value = "";
643 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
644 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
645 size_t new_len = strlen(new_value);
646 const char* value;
647 char* free_this_too = NULL;
648 if (old_len == 0) {
649 value = new_value;
650 } else if (new_len == 0) {
651 value = old_value;
652 } else {
653 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
654 // each new setting adds another LINE to the switch:
655 sprintf(buf, "%s\n%s", old_value, new_value);
656 value = buf;
657 free_this_too = buf;
658 }
659 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
660 // CommandLineFlags always returns a pointer that needs freeing.
661 FREE_C_HEAP_ARRAY(char, value);
662 if (free_this_too != NULL) {
663 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
664 FREE_C_HEAP_ARRAY(char, free_this_too);
665 }
666 return true;
667 }
669 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
671 // range of acceptable characters spelled out for portability reasons
672 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
673 #define BUFLEN 255
674 char name[BUFLEN+1];
675 char dummy;
677 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
678 return set_bool_flag(name, false, origin);
679 }
680 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
681 return set_bool_flag(name, true, origin);
682 }
684 char punct;
685 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
686 const char* value = strchr(arg, '=') + 1;
687 Flag* flag = Flag::find_flag(name, strlen(name));
688 if (flag != NULL && flag->is_ccstr()) {
689 if (flag->ccstr_accumulates()) {
690 return append_to_string_flag(name, value, origin);
691 } else {
692 if (value[0] == '\0') {
693 value = NULL;
694 }
695 return set_string_flag(name, value, origin);
696 }
697 }
698 }
700 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
701 const char* value = strchr(arg, '=') + 1;
702 // -XX:Foo:=xxx will reset the string flag to the given value.
703 if (value[0] == '\0') {
704 value = NULL;
705 }
706 return set_string_flag(name, value, origin);
707 }
709 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
710 #define SIGNED_NUMBER_RANGE "[-0123456789]"
711 #define NUMBER_RANGE "[0123456789]"
712 char value[BUFLEN + 1];
713 char value2[BUFLEN + 1];
714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
715 // Looks like a floating-point number -- try again with more lenient format string
716 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
717 return set_fp_numeric_flag(name, value, origin);
718 }
719 }
721 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
722 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
723 return set_numeric_flag(name, value, origin);
724 }
726 return false;
727 }
729 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
730 assert(bldarray != NULL, "illegal argument");
732 if (arg == NULL) {
733 return;
734 }
736 int index = *count;
738 // expand the array and add arg to the last element
739 (*count)++;
740 if (*bldarray == NULL) {
741 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
742 } else {
743 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
744 }
745 (*bldarray)[index] = strdup(arg);
746 }
748 void Arguments::build_jvm_args(const char* arg) {
749 add_string(&_jvm_args_array, &_num_jvm_args, arg);
750 }
752 void Arguments::build_jvm_flags(const char* arg) {
753 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
754 }
756 // utility function to return a string that concatenates all
757 // strings in a given char** array
758 const char* Arguments::build_resource_string(char** args, int count) {
759 if (args == NULL || count == 0) {
760 return NULL;
761 }
762 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
763 for (int i = 1; i < count; i++) {
764 length += strlen(args[i]) + 1; // add 1 for a space
765 }
766 char* s = NEW_RESOURCE_ARRAY(char, length);
767 strcpy(s, args[0]);
768 for (int j = 1; j < count; j++) {
769 strcat(s, " ");
770 strcat(s, args[j]);
771 }
772 return (const char*) s;
773 }
775 void Arguments::print_on(outputStream* st) {
776 st->print_cr("VM Arguments:");
777 if (num_jvm_flags() > 0) {
778 st->print("jvm_flags: "); print_jvm_flags_on(st);
779 }
780 if (num_jvm_args() > 0) {
781 st->print("jvm_args: "); print_jvm_args_on(st);
782 }
783 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
784 st->print_cr("Launcher Type: %s", _sun_java_launcher);
785 }
787 void Arguments::print_jvm_flags_on(outputStream* st) {
788 if (_num_jvm_flags > 0) {
789 for (int i=0; i < _num_jvm_flags; i++) {
790 st->print("%s ", _jvm_flags_array[i]);
791 }
792 st->print_cr("");
793 }
794 }
796 void Arguments::print_jvm_args_on(outputStream* st) {
797 if (_num_jvm_args > 0) {
798 for (int i=0; i < _num_jvm_args; i++) {
799 st->print("%s ", _jvm_args_array[i]);
800 }
801 st->print_cr("");
802 }
803 }
805 bool Arguments::process_argument(const char* arg,
806 jboolean ignore_unrecognized, FlagValueOrigin origin) {
808 JDK_Version since = JDK_Version();
810 if (parse_argument(arg, origin) || ignore_unrecognized) {
811 return true;
812 }
814 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
815 if (is_newly_obsolete(arg, &since)) {
816 char version[256];
817 since.to_string(version, sizeof(version));
818 warning("ignoring option %s; support was removed in %s", argname, version);
819 return true;
820 }
822 jio_fprintf(defaultStream::error_stream(),
823 "Unrecognized VM option '%s'\n", argname);
824 // allow for commandline "commenting out" options like -XX:#+Verbose
825 return arg[0] == '#';
826 }
828 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
829 FILE* stream = fopen(file_name, "rb");
830 if (stream == NULL) {
831 if (should_exist) {
832 jio_fprintf(defaultStream::error_stream(),
833 "Could not open settings file %s\n", file_name);
834 return false;
835 } else {
836 return true;
837 }
838 }
840 char token[1024];
841 int pos = 0;
843 bool in_white_space = true;
844 bool in_comment = false;
845 bool in_quote = false;
846 char quote_c = 0;
847 bool result = true;
849 int c = getc(stream);
850 while(c != EOF) {
851 if (in_white_space) {
852 if (in_comment) {
853 if (c == '\n') in_comment = false;
854 } else {
855 if (c == '#') in_comment = true;
856 else if (!isspace(c)) {
857 in_white_space = false;
858 token[pos++] = c;
859 }
860 }
861 } else {
862 if (c == '\n' || (!in_quote && isspace(c))) {
863 // token ends at newline, or at unquoted whitespace
864 // this allows a way to include spaces in string-valued options
865 token[pos] = '\0';
866 logOption(token);
867 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
868 build_jvm_flags(token);
869 pos = 0;
870 in_white_space = true;
871 in_quote = false;
872 } else if (!in_quote && (c == '\'' || c == '"')) {
873 in_quote = true;
874 quote_c = c;
875 } else if (in_quote && (c == quote_c)) {
876 in_quote = false;
877 } else {
878 token[pos++] = c;
879 }
880 }
881 c = getc(stream);
882 }
883 if (pos > 0) {
884 token[pos] = '\0';
885 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
886 build_jvm_flags(token);
887 }
888 fclose(stream);
889 return result;
890 }
892 //=============================================================================================================
893 // Parsing of properties (-D)
895 const char* Arguments::get_property(const char* key) {
896 return PropertyList_get_value(system_properties(), key);
897 }
899 bool Arguments::add_property(const char* prop) {
900 const char* eq = strchr(prop, '=');
901 char* key;
902 // ns must be static--its address may be stored in a SystemProperty object.
903 const static char ns[1] = {0};
904 char* value = (char *)ns;
906 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
907 key = AllocateHeap(key_len + 1, "add_property");
908 strncpy(key, prop, key_len);
909 key[key_len] = '\0';
911 if (eq != NULL) {
912 size_t value_len = strlen(prop) - key_len - 1;
913 value = AllocateHeap(value_len + 1, "add_property");
914 strncpy(value, &prop[key_len + 1], value_len + 1);
915 }
917 if (strcmp(key, "java.compiler") == 0) {
918 process_java_compiler_argument(value);
919 FreeHeap(key);
920 if (eq != NULL) {
921 FreeHeap(value);
922 }
923 return true;
924 } else if (strcmp(key, "sun.java.command") == 0) {
925 _java_command = value;
927 // Record value in Arguments, but let it get passed to Java.
928 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
929 // launcher.pid property is private and is processed
930 // in process_sun_java_launcher_properties();
931 // the sun.java.launcher property is passed on to the java application
932 FreeHeap(key);
933 if (eq != NULL) {
934 FreeHeap(value);
935 }
936 return true;
937 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
938 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
939 // its value without going through the property list or making a Java call.
940 _java_vendor_url_bug = value;
941 } else if (strcmp(key, "sun.boot.library.path") == 0) {
942 PropertyList_unique_add(&_system_properties, key, value, true);
943 return true;
944 }
945 // Create new property and add at the end of the list
946 PropertyList_unique_add(&_system_properties, key, value);
947 return true;
948 }
950 //===========================================================================================================
951 // Setting int/mixed/comp mode flags
953 void Arguments::set_mode_flags(Mode mode) {
954 // Set up default values for all flags.
955 // If you add a flag to any of the branches below,
956 // add a default value for it here.
957 set_java_compiler(false);
958 _mode = mode;
960 // Ensure Agent_OnLoad has the correct initial values.
961 // This may not be the final mode; mode may change later in onload phase.
962 PropertyList_unique_add(&_system_properties, "java.vm.info",
963 (char*)VM_Version::vm_info_string(), false);
965 UseInterpreter = true;
966 UseCompiler = true;
967 UseLoopCounter = true;
969 #ifndef ZERO
970 // Turn these off for mixed and comp. Leave them on for Zero.
971 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
972 UseFastAccessorMethods = (mode == _int);
973 }
974 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
975 UseFastEmptyMethods = (mode == _int);
976 }
977 #endif
979 // Default values may be platform/compiler dependent -
980 // use the saved values
981 ClipInlining = Arguments::_ClipInlining;
982 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
983 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
984 BackgroundCompilation = Arguments::_BackgroundCompilation;
986 // Change from defaults based on mode
987 switch (mode) {
988 default:
989 ShouldNotReachHere();
990 break;
991 case _int:
992 UseCompiler = false;
993 UseLoopCounter = false;
994 AlwaysCompileLoopMethods = false;
995 UseOnStackReplacement = false;
996 break;
997 case _mixed:
998 // same as default
999 break;
1000 case _comp:
1001 UseInterpreter = false;
1002 BackgroundCompilation = false;
1003 ClipInlining = false;
1004 break;
1005 }
1006 }
1008 // Conflict: required to use shared spaces (-Xshare:on), but
1009 // incompatible command line options were chosen.
1011 static void no_shared_spaces() {
1012 if (RequireSharedSpaces) {
1013 jio_fprintf(defaultStream::error_stream(),
1014 "Class data sharing is inconsistent with other specified options.\n");
1015 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1016 } else {
1017 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1018 }
1019 }
1021 void Arguments::set_tiered_flags() {
1022 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1023 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1024 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1025 }
1026 if (CompilationPolicyChoice < 2) {
1027 vm_exit_during_initialization(
1028 "Incompatible compilation policy selected", NULL);
1029 }
1030 // Increase the code cache size - tiered compiles a lot more.
1031 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1032 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1033 }
1034 }
1036 #ifndef KERNEL
1037 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1038 // if it's not explictly set or unset. If the user has chosen
1039 // UseParNewGC and not explicitly set ParallelGCThreads we
1040 // set it, unless this is a single cpu machine.
1041 void Arguments::set_parnew_gc_flags() {
1042 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1043 "control point invariant");
1044 assert(UseParNewGC, "Error");
1046 // Turn off AdaptiveSizePolicy by default for parnew until it is
1047 // complete.
1048 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1049 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1050 }
1052 if (ParallelGCThreads == 0) {
1053 FLAG_SET_DEFAULT(ParallelGCThreads,
1054 Abstract_VM_Version::parallel_worker_threads());
1055 if (ParallelGCThreads == 1) {
1056 FLAG_SET_DEFAULT(UseParNewGC, false);
1057 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1058 }
1059 }
1060 if (UseParNewGC) {
1061 // CDS doesn't work with ParNew yet
1062 no_shared_spaces();
1064 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1065 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1066 // we set them to 1024 and 1024.
1067 // See CR 6362902.
1068 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1069 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1070 }
1071 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1072 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1073 }
1075 // AlwaysTenure flag should make ParNew promote all at first collection.
1076 // See CR 6362902.
1077 if (AlwaysTenure) {
1078 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1079 }
1080 // When using compressed oops, we use local overflow stacks,
1081 // rather than using a global overflow list chained through
1082 // the klass word of the object's pre-image.
1083 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1084 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1085 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1086 }
1087 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1088 }
1089 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1090 }
1091 }
1093 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1094 // sparc/solaris for certain applications, but would gain from
1095 // further optimization and tuning efforts, and would almost
1096 // certainly gain from analysis of platform and environment.
1097 void Arguments::set_cms_and_parnew_gc_flags() {
1098 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1099 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1101 // If we are using CMS, we prefer to UseParNewGC,
1102 // unless explicitly forbidden.
1103 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1104 FLAG_SET_ERGO(bool, UseParNewGC, true);
1105 }
1107 // Turn off AdaptiveSizePolicy by default for cms until it is
1108 // complete.
1109 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1110 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1111 }
1113 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1114 // as needed.
1115 if (UseParNewGC) {
1116 set_parnew_gc_flags();
1117 }
1119 // MaxHeapSize is aligned down in collectorPolicy
1120 size_t max_heap = align_size_down(MaxHeapSize,
1121 CardTableRS::ct_max_alignment_constraint());
1123 // Now make adjustments for CMS
1124 intx tenuring_default = (intx)6;
1125 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1127 // Preferred young gen size for "short" pauses:
1128 // upper bound depends on # of threads and NewRatio.
1129 const uintx parallel_gc_threads =
1130 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1131 const size_t preferred_max_new_size_unaligned =
1132 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1133 size_t preferred_max_new_size =
1134 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1136 // Unless explicitly requested otherwise, size young gen
1137 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1139 // If either MaxNewSize or NewRatio is set on the command line,
1140 // assume the user is trying to set the size of the young gen.
1141 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1143 // Set MaxNewSize to our calculated preferred_max_new_size unless
1144 // NewSize was set on the command line and it is larger than
1145 // preferred_max_new_size.
1146 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1147 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1148 } else {
1149 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1150 }
1151 if (PrintGCDetails && Verbose) {
1152 // Too early to use gclog_or_tty
1153 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1154 }
1156 // Code along this path potentially sets NewSize and OldSize
1158 assert(max_heap >= InitialHeapSize, "Error");
1159 assert(max_heap >= NewSize, "Error");
1161 if (PrintGCDetails && Verbose) {
1162 // Too early to use gclog_or_tty
1163 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1164 " initial_heap_size: " SIZE_FORMAT
1165 " max_heap: " SIZE_FORMAT,
1166 min_heap_size(), InitialHeapSize, max_heap);
1167 }
1168 size_t min_new = preferred_max_new_size;
1169 if (FLAG_IS_CMDLINE(NewSize)) {
1170 min_new = NewSize;
1171 }
1172 if (max_heap > min_new && min_heap_size() > min_new) {
1173 // Unless explicitly requested otherwise, make young gen
1174 // at least min_new, and at most preferred_max_new_size.
1175 if (FLAG_IS_DEFAULT(NewSize)) {
1176 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1177 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1178 if (PrintGCDetails && Verbose) {
1179 // Too early to use gclog_or_tty
1180 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1181 }
1182 }
1183 // Unless explicitly requested otherwise, size old gen
1184 // so it's NewRatio x of NewSize.
1185 if (FLAG_IS_DEFAULT(OldSize)) {
1186 if (max_heap > NewSize) {
1187 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1188 if (PrintGCDetails && Verbose) {
1189 // Too early to use gclog_or_tty
1190 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1191 }
1192 }
1193 }
1194 }
1195 }
1196 // Unless explicitly requested otherwise, definitely
1197 // promote all objects surviving "tenuring_default" scavenges.
1198 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1199 FLAG_IS_DEFAULT(SurvivorRatio)) {
1200 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1201 }
1202 // If we decided above (or user explicitly requested)
1203 // `promote all' (via MaxTenuringThreshold := 0),
1204 // prefer minuscule survivor spaces so as not to waste
1205 // space for (non-existent) survivors
1206 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1207 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1208 }
1209 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1210 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1211 // This is done in order to make ParNew+CMS configuration to work
1212 // with YoungPLABSize and OldPLABSize options.
1213 // See CR 6362902.
1214 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1215 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1216 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1217 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1218 // the value (either from the command line or ergonomics) of
1219 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1220 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1221 } else {
1222 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1223 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1224 // we'll let it to take precedence.
1225 jio_fprintf(defaultStream::error_stream(),
1226 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1227 " options are specified for the CMS collector."
1228 " CMSParPromoteBlocksToClaim will take precedence.\n");
1229 }
1230 }
1231 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1232 // OldPLAB sizing manually turned off: Use a larger default setting,
1233 // unless it was manually specified. This is because a too-low value
1234 // will slow down scavenges.
1235 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1236 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1237 }
1238 }
1239 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1240 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1241 // If either of the static initialization defaults have changed, note this
1242 // modification.
1243 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1244 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1245 }
1246 if (PrintGCDetails && Verbose) {
1247 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1248 MarkStackSize / K, MarkStackSizeMax / K);
1249 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1250 }
1251 }
1252 #endif // KERNEL
1254 void set_object_alignment() {
1255 // Object alignment.
1256 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1257 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1258 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1259 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1260 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1261 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1263 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1264 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1266 // Oop encoding heap max
1267 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1269 #ifndef KERNEL
1270 // Set CMS global values
1271 CompactibleFreeListSpace::set_cms_values();
1272 #endif // KERNEL
1273 }
1275 bool verify_object_alignment() {
1276 // Object alignment.
1277 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1278 jio_fprintf(defaultStream::error_stream(),
1279 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1280 (int)ObjectAlignmentInBytes);
1281 return false;
1282 }
1283 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1284 jio_fprintf(defaultStream::error_stream(),
1285 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1286 (int)ObjectAlignmentInBytes, BytesPerLong);
1287 return false;
1288 }
1289 // It does not make sense to have big object alignment
1290 // since a space lost due to alignment will be greater
1291 // then a saved space from compressed oops.
1292 if ((int)ObjectAlignmentInBytes > 256) {
1293 jio_fprintf(defaultStream::error_stream(),
1294 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1295 (int)ObjectAlignmentInBytes);
1296 return false;
1297 }
1298 // In case page size is very small.
1299 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1300 jio_fprintf(defaultStream::error_stream(),
1301 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1302 (int)ObjectAlignmentInBytes, os::vm_page_size());
1303 return false;
1304 }
1305 return true;
1306 }
1308 inline uintx max_heap_for_compressed_oops() {
1309 // Avoid sign flip.
1310 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1311 return 0;
1312 }
1313 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1314 NOT_LP64(ShouldNotReachHere(); return 0);
1315 }
1317 bool Arguments::should_auto_select_low_pause_collector() {
1318 if (UseAutoGCSelectPolicy &&
1319 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1320 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1321 if (PrintGCDetails) {
1322 // Cannot use gclog_or_tty yet.
1323 tty->print_cr("Automatic selection of the low pause collector"
1324 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1325 }
1326 return true;
1327 }
1328 return false;
1329 }
1331 void Arguments::set_ergonomics_flags() {
1332 // Parallel GC is not compatible with sharing. If one specifies
1333 // that they want sharing explicitly, do not set ergonomics flags.
1334 if (DumpSharedSpaces || RequireSharedSpaces) {
1335 return;
1336 }
1338 if (os::is_server_class_machine() && !force_client_mode ) {
1339 // If no other collector is requested explicitly,
1340 // let the VM select the collector based on
1341 // machine class and automatic selection policy.
1342 if (!UseSerialGC &&
1343 !UseConcMarkSweepGC &&
1344 !UseG1GC &&
1345 !UseParNewGC &&
1346 !DumpSharedSpaces &&
1347 FLAG_IS_DEFAULT(UseParallelGC)) {
1348 if (should_auto_select_low_pause_collector()) {
1349 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1350 } else {
1351 FLAG_SET_ERGO(bool, UseParallelGC, true);
1352 }
1353 no_shared_spaces();
1354 }
1355 }
1357 #ifndef ZERO
1358 #ifdef _LP64
1359 // Check that UseCompressedOops can be set with the max heap size allocated
1360 // by ergonomics.
1361 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1362 #if !defined(COMPILER1) || defined(TIERED)
1363 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1364 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1365 }
1366 #endif
1367 #ifdef _WIN64
1368 if (UseLargePages && UseCompressedOops) {
1369 // Cannot allocate guard pages for implicit checks in indexed addressing
1370 // mode, when large pages are specified on windows.
1371 // This flag could be switched ON if narrow oop base address is set to 0,
1372 // see code in Universe::initialize_heap().
1373 Universe::set_narrow_oop_use_implicit_null_checks(false);
1374 }
1375 #endif // _WIN64
1376 } else {
1377 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1378 warning("Max heap size too large for Compressed Oops");
1379 FLAG_SET_DEFAULT(UseCompressedOops, false);
1380 }
1381 }
1382 // Also checks that certain machines are slower with compressed oops
1383 // in vm_version initialization code.
1384 #endif // _LP64
1385 #endif // !ZERO
1386 }
1388 void Arguments::set_parallel_gc_flags() {
1389 assert(UseParallelGC || UseParallelOldGC, "Error");
1390 // If parallel old was requested, automatically enable parallel scavenge.
1391 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1392 FLAG_SET_DEFAULT(UseParallelGC, true);
1393 }
1395 // If no heap maximum was requested explicitly, use some reasonable fraction
1396 // of the physical memory, up to a maximum of 1GB.
1397 if (UseParallelGC) {
1398 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1399 Abstract_VM_Version::parallel_worker_threads());
1401 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1402 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1403 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1404 // See CR 6362902 for details.
1405 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1406 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1407 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1408 }
1409 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1410 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1411 }
1412 }
1414 if (UseParallelOldGC) {
1415 // Par compact uses lower default values since they are treated as
1416 // minimums. These are different defaults because of the different
1417 // interpretation and are not ergonomically set.
1418 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1419 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1420 }
1421 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1422 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1423 }
1424 }
1425 }
1426 if (UseNUMA) {
1427 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1428 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1429 }
1430 }
1431 }
1433 void Arguments::set_g1_gc_flags() {
1434 assert(UseG1GC, "Error");
1435 #ifdef COMPILER1
1436 FastTLABRefill = false;
1437 #endif
1438 FLAG_SET_DEFAULT(ParallelGCThreads,
1439 Abstract_VM_Version::parallel_worker_threads());
1440 if (ParallelGCThreads == 0) {
1441 FLAG_SET_DEFAULT(ParallelGCThreads,
1442 Abstract_VM_Version::parallel_worker_threads());
1443 }
1444 no_shared_spaces();
1446 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1447 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1448 }
1449 if (PrintGCDetails && Verbose) {
1450 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1451 MarkStackSize / K, MarkStackSizeMax / K);
1452 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1453 }
1455 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1456 // In G1, we want the default GC overhead goal to be higher than
1457 // say in PS. So we set it here to 10%. Otherwise the heap might
1458 // be expanded more aggressively than we would like it to. In
1459 // fact, even 10% seems to not be high enough in some cases
1460 // (especially small GC stress tests that the main thing they do
1461 // is allocation). We might consider increase it further.
1462 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1463 }
1464 }
1466 void Arguments::set_heap_size() {
1467 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1468 // Deprecated flag
1469 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1470 }
1472 const julong phys_mem =
1473 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1474 : (julong)MaxRAM;
1476 // If the maximum heap size has not been set with -Xmx,
1477 // then set it as fraction of the size of physical memory,
1478 // respecting the maximum and minimum sizes of the heap.
1479 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1480 julong reasonable_max = phys_mem / MaxRAMFraction;
1482 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1483 // Small physical memory, so use a minimum fraction of it for the heap
1484 reasonable_max = phys_mem / MinRAMFraction;
1485 } else {
1486 // Not-small physical memory, so require a heap at least
1487 // as large as MaxHeapSize
1488 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1489 }
1490 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1491 // Limit the heap size to ErgoHeapSizeLimit
1492 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1493 }
1494 if (UseCompressedOops) {
1495 // Limit the heap size to the maximum possible when using compressed oops
1496 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1497 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1498 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1499 // but it should be not less than default MaxHeapSize.
1500 max_coop_heap -= HeapBaseMinAddress;
1501 }
1502 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1503 }
1504 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1506 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1507 // An initial heap size was specified on the command line,
1508 // so be sure that the maximum size is consistent. Done
1509 // after call to allocatable_physical_memory because that
1510 // method might reduce the allocation size.
1511 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1512 }
1514 if (PrintGCDetails && Verbose) {
1515 // Cannot use gclog_or_tty yet.
1516 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1517 }
1518 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1519 }
1521 // If the initial_heap_size has not been set with InitialHeapSize
1522 // or -Xms, then set it as fraction of the size of physical memory,
1523 // respecting the maximum and minimum sizes of the heap.
1524 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1525 julong reasonable_minimum = (julong)(OldSize + NewSize);
1527 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1529 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1531 julong reasonable_initial = phys_mem / InitialRAMFraction;
1533 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1534 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1536 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1538 if (PrintGCDetails && Verbose) {
1539 // Cannot use gclog_or_tty yet.
1540 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1541 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1542 }
1543 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1544 set_min_heap_size((uintx)reasonable_minimum);
1545 }
1546 }
1548 // This must be called after ergonomics because we want bytecode rewriting
1549 // if the server compiler is used, or if UseSharedSpaces is disabled.
1550 void Arguments::set_bytecode_flags() {
1551 // Better not attempt to store into a read-only space.
1552 if (UseSharedSpaces) {
1553 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1554 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1555 }
1557 if (!RewriteBytecodes) {
1558 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1559 }
1560 }
1562 // Aggressive optimization flags -XX:+AggressiveOpts
1563 void Arguments::set_aggressive_opts_flags() {
1564 #ifdef COMPILER2
1565 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1566 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1567 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1568 }
1569 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1570 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1571 }
1573 // Feed the cache size setting into the JDK
1574 char buffer[1024];
1575 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1576 add_property(buffer);
1577 }
1578 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1579 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1580 }
1581 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1582 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1583 }
1584 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1585 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1586 }
1587 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1588 FLAG_SET_DEFAULT(OptimizeFill, true);
1589 }
1590 #endif
1592 if (AggressiveOpts) {
1593 // Sample flag setting code
1594 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1595 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1596 // }
1597 }
1598 }
1600 //===========================================================================================================
1601 // Parsing of java.compiler property
1603 void Arguments::process_java_compiler_argument(char* arg) {
1604 // For backwards compatibility, Djava.compiler=NONE or ""
1605 // causes us to switch to -Xint mode UNLESS -Xdebug
1606 // is also specified.
1607 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1608 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1609 }
1610 }
1612 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1613 _sun_java_launcher = strdup(launcher);
1614 if (strcmp("gamma", _sun_java_launcher) == 0) {
1615 _created_by_gamma_launcher = true;
1616 }
1617 }
1619 bool Arguments::created_by_java_launcher() {
1620 assert(_sun_java_launcher != NULL, "property must have value");
1621 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1622 }
1624 bool Arguments::created_by_gamma_launcher() {
1625 return _created_by_gamma_launcher;
1626 }
1628 //===========================================================================================================
1629 // Parsing of main arguments
1631 bool Arguments::verify_interval(uintx val, uintx min,
1632 uintx max, const char* name) {
1633 // Returns true iff value is in the inclusive interval [min..max]
1634 // false, otherwise.
1635 if (val >= min && val <= max) {
1636 return true;
1637 }
1638 jio_fprintf(defaultStream::error_stream(),
1639 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1640 " and " UINTX_FORMAT "\n",
1641 name, val, min, max);
1642 return false;
1643 }
1645 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1646 // Returns true if given value is at least specified min threshold
1647 // false, otherwise.
1648 if (val >= min ) {
1649 return true;
1650 }
1651 jio_fprintf(defaultStream::error_stream(),
1652 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1653 name, val, min);
1654 return false;
1655 }
1657 bool Arguments::verify_percentage(uintx value, const char* name) {
1658 if (value <= 100) {
1659 return true;
1660 }
1661 jio_fprintf(defaultStream::error_stream(),
1662 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1663 name, value);
1664 return false;
1665 }
1667 static void force_serial_gc() {
1668 FLAG_SET_DEFAULT(UseSerialGC, true);
1669 FLAG_SET_DEFAULT(UseParNewGC, false);
1670 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1671 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1672 FLAG_SET_DEFAULT(UseParallelGC, false);
1673 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1674 FLAG_SET_DEFAULT(UseG1GC, false);
1675 }
1677 static bool verify_serial_gc_flags() {
1678 return (UseSerialGC &&
1679 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1680 UseParallelGC || UseParallelOldGC));
1681 }
1683 // check if do gclog rotation
1684 // +UseGCLogFileRotation is a must,
1685 // no gc log rotation when log file not supplied or
1686 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1687 void check_gclog_consistency() {
1688 if (UseGCLogFileRotation) {
1689 if ((Arguments::gc_log_filename() == NULL) ||
1690 (NumberOfGCLogFiles == 0) ||
1691 (GCLogFileSize == 0)) {
1692 jio_fprintf(defaultStream::output_stream(),
1693 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1694 "where num_of_file > 0 and num_of_size > 0\n"
1695 "GC log rotation is turned off\n");
1696 UseGCLogFileRotation = false;
1697 }
1698 }
1700 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1701 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1702 jio_fprintf(defaultStream::output_stream(),
1703 "GCLogFileSize changed to minimum 8K\n");
1704 }
1705 }
1707 // Check consistency of GC selection
1708 bool Arguments::check_gc_consistency() {
1709 check_gclog_consistency();
1710 bool status = true;
1711 // Ensure that the user has not selected conflicting sets
1712 // of collectors. [Note: this check is merely a user convenience;
1713 // collectors over-ride each other so that only a non-conflicting
1714 // set is selected; however what the user gets is not what they
1715 // may have expected from the combination they asked for. It's
1716 // better to reduce user confusion by not allowing them to
1717 // select conflicting combinations.
1718 uint i = 0;
1719 if (UseSerialGC) i++;
1720 if (UseConcMarkSweepGC || UseParNewGC) i++;
1721 if (UseParallelGC || UseParallelOldGC) i++;
1722 if (UseG1GC) i++;
1723 if (i > 1) {
1724 jio_fprintf(defaultStream::error_stream(),
1725 "Conflicting collector combinations in option list; "
1726 "please refer to the release notes for the combinations "
1727 "allowed\n");
1728 status = false;
1729 }
1731 return status;
1732 }
1734 // Check stack pages settings
1735 bool Arguments::check_stack_pages()
1736 {
1737 bool status = true;
1738 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1739 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1740 // greater stack shadow pages can't generate instruction to bang stack
1741 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1742 return status;
1743 }
1745 // Check the consistency of vm_init_args
1746 bool Arguments::check_vm_args_consistency() {
1747 // Method for adding checks for flag consistency.
1748 // The intent is to warn the user of all possible conflicts,
1749 // before returning an error.
1750 // Note: Needs platform-dependent factoring.
1751 bool status = true;
1753 #if ( (defined(COMPILER2) && defined(SPARC)))
1754 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1755 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1756 // x86. Normally, VM_Version_init must be called from init_globals in
1757 // init.cpp, which is called by the initial java thread *after* arguments
1758 // have been parsed. VM_Version_init gets called twice on sparc.
1759 extern void VM_Version_init();
1760 VM_Version_init();
1761 if (!VM_Version::has_v9()) {
1762 jio_fprintf(defaultStream::error_stream(),
1763 "V8 Machine detected, Server requires V9\n");
1764 status = false;
1765 }
1766 #endif /* COMPILER2 && SPARC */
1768 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1769 // builds so the cost of stack banging can be measured.
1770 #if (defined(PRODUCT) && defined(SOLARIS))
1771 if (!UseBoundThreads && !UseStackBanging) {
1772 jio_fprintf(defaultStream::error_stream(),
1773 "-UseStackBanging conflicts with -UseBoundThreads\n");
1775 status = false;
1776 }
1777 #endif
1779 if (TLABRefillWasteFraction == 0) {
1780 jio_fprintf(defaultStream::error_stream(),
1781 "TLABRefillWasteFraction should be a denominator, "
1782 "not " SIZE_FORMAT "\n",
1783 TLABRefillWasteFraction);
1784 status = false;
1785 }
1787 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1788 "AdaptiveSizePolicyWeight");
1789 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1790 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1791 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1792 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1794 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1795 jio_fprintf(defaultStream::error_stream(),
1796 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1797 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1798 MinHeapFreeRatio, MaxHeapFreeRatio);
1799 status = false;
1800 }
1801 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1802 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1804 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1805 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1806 }
1808 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1809 // Settings to encourage splitting.
1810 if (!FLAG_IS_CMDLINE(NewRatio)) {
1811 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1812 }
1813 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1814 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1815 }
1816 }
1818 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1819 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1820 if (GCTimeLimit == 100) {
1821 // Turn off gc-overhead-limit-exceeded checks
1822 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1823 }
1825 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1827 status = status && check_gc_consistency();
1828 status = status && check_stack_pages();
1830 if (_has_alloc_profile) {
1831 if (UseParallelGC || UseParallelOldGC) {
1832 jio_fprintf(defaultStream::error_stream(),
1833 "error: invalid argument combination.\n"
1834 "Allocation profiling (-Xaprof) cannot be used together with "
1835 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1836 status = false;
1837 }
1838 if (UseConcMarkSweepGC) {
1839 jio_fprintf(defaultStream::error_stream(),
1840 "error: invalid argument combination.\n"
1841 "Allocation profiling (-Xaprof) cannot be used together with "
1842 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1843 status = false;
1844 }
1845 }
1847 if (CMSIncrementalMode) {
1848 if (!UseConcMarkSweepGC) {
1849 jio_fprintf(defaultStream::error_stream(),
1850 "error: invalid argument combination.\n"
1851 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1852 "selected in order\nto use CMSIncrementalMode.\n");
1853 status = false;
1854 } else {
1855 status = status && verify_percentage(CMSIncrementalDutyCycle,
1856 "CMSIncrementalDutyCycle");
1857 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1858 "CMSIncrementalDutyCycleMin");
1859 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1860 "CMSIncrementalSafetyFactor");
1861 status = status && verify_percentage(CMSIncrementalOffset,
1862 "CMSIncrementalOffset");
1863 status = status && verify_percentage(CMSExpAvgFactor,
1864 "CMSExpAvgFactor");
1865 // If it was not set on the command line, set
1866 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1867 if (CMSInitiatingOccupancyFraction < 0) {
1868 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1869 }
1870 }
1871 }
1873 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1874 // insists that we hold the requisite locks so that the iteration is
1875 // MT-safe. For the verification at start-up and shut-down, we don't
1876 // yet have a good way of acquiring and releasing these locks,
1877 // which are not visible at the CollectedHeap level. We want to
1878 // be able to acquire these locks and then do the iteration rather
1879 // than just disable the lock verification. This will be fixed under
1880 // bug 4788986.
1881 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1882 if (VerifyGCStartAt == 0) {
1883 warning("Heap verification at start-up disabled "
1884 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1885 VerifyGCStartAt = 1; // Disable verification at start-up
1886 }
1887 if (VerifyBeforeExit) {
1888 warning("Heap verification at shutdown disabled "
1889 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1890 VerifyBeforeExit = false; // Disable verification at shutdown
1891 }
1892 }
1894 // Note: only executed in non-PRODUCT mode
1895 if (!UseAsyncConcMarkSweepGC &&
1896 (ExplicitGCInvokesConcurrent ||
1897 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1898 jio_fprintf(defaultStream::error_stream(),
1899 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1900 " with -UseAsyncConcMarkSweepGC");
1901 status = false;
1902 }
1904 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1906 #ifndef SERIALGC
1907 if (UseG1GC) {
1908 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1909 "InitiatingHeapOccupancyPercent");
1910 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1911 "G1RefProcDrainInterval");
1912 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1913 "G1ConcMarkStepDurationMillis");
1914 }
1915 #endif
1917 status = status && verify_interval(RefDiscoveryPolicy,
1918 ReferenceProcessor::DiscoveryPolicyMin,
1919 ReferenceProcessor::DiscoveryPolicyMax,
1920 "RefDiscoveryPolicy");
1922 // Limit the lower bound of this flag to 1 as it is used in a division
1923 // expression.
1924 status = status && verify_interval(TLABWasteTargetPercent,
1925 1, 100, "TLABWasteTargetPercent");
1927 status = status && verify_object_alignment();
1929 return status;
1930 }
1932 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1933 const char* option_type) {
1934 if (ignore) return false;
1936 const char* spacer = " ";
1937 if (option_type == NULL) {
1938 option_type = ++spacer; // Set both to the empty string.
1939 }
1941 if (os::obsolete_option(option)) {
1942 jio_fprintf(defaultStream::error_stream(),
1943 "Obsolete %s%soption: %s\n", option_type, spacer,
1944 option->optionString);
1945 return false;
1946 } else {
1947 jio_fprintf(defaultStream::error_stream(),
1948 "Unrecognized %s%soption: %s\n", option_type, spacer,
1949 option->optionString);
1950 return true;
1951 }
1952 }
1954 static const char* user_assertion_options[] = {
1955 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1956 };
1958 static const char* system_assertion_options[] = {
1959 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1960 };
1962 // Return true if any of the strings in null-terminated array 'names' matches.
1963 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1964 // the option must match exactly.
1965 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1966 bool tail_allowed) {
1967 for (/* empty */; *names != NULL; ++names) {
1968 if (match_option(option, *names, tail)) {
1969 if (**tail == '\0' || tail_allowed && **tail == ':') {
1970 return true;
1971 }
1972 }
1973 }
1974 return false;
1975 }
1977 bool Arguments::parse_uintx(const char* value,
1978 uintx* uintx_arg,
1979 uintx min_size) {
1981 // Check the sign first since atomull() parses only unsigned values.
1982 bool value_is_positive = !(*value == '-');
1984 if (value_is_positive) {
1985 julong n;
1986 bool good_return = atomull(value, &n);
1987 if (good_return) {
1988 bool above_minimum = n >= min_size;
1989 bool value_is_too_large = n > max_uintx;
1991 if (above_minimum && !value_is_too_large) {
1992 *uintx_arg = n;
1993 return true;
1994 }
1995 }
1996 }
1997 return false;
1998 }
2000 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2001 julong* long_arg,
2002 julong min_size) {
2003 if (!atomull(s, long_arg)) return arg_unreadable;
2004 return check_memory_size(*long_arg, min_size);
2005 }
2007 // Parse JavaVMInitArgs structure
2009 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2010 // For components of the system classpath.
2011 SysClassPath scp(Arguments::get_sysclasspath());
2012 bool scp_assembly_required = false;
2014 // Save default settings for some mode flags
2015 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2016 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2017 Arguments::_ClipInlining = ClipInlining;
2018 Arguments::_BackgroundCompilation = BackgroundCompilation;
2020 // Setup flags for mixed which is the default
2021 set_mode_flags(_mixed);
2023 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2024 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2025 if (result != JNI_OK) {
2026 return result;
2027 }
2029 // Parse JavaVMInitArgs structure passed in
2030 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2031 if (result != JNI_OK) {
2032 return result;
2033 }
2035 if (AggressiveOpts) {
2036 // Insert alt-rt.jar between user-specified bootclasspath
2037 // prefix and the default bootclasspath. os::set_boot_path()
2038 // uses meta_index_dir as the default bootclasspath directory.
2039 const char* altclasses_jar = "alt-rt.jar";
2040 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2041 strlen(altclasses_jar);
2042 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2043 strcpy(altclasses_path, get_meta_index_dir());
2044 strcat(altclasses_path, altclasses_jar);
2045 scp.add_suffix_to_prefix(altclasses_path);
2046 scp_assembly_required = true;
2047 FREE_C_HEAP_ARRAY(char, altclasses_path);
2048 }
2050 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2051 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2052 if (result != JNI_OK) {
2053 return result;
2054 }
2056 // Do final processing now that all arguments have been parsed
2057 result = finalize_vm_init_args(&scp, scp_assembly_required);
2058 if (result != JNI_OK) {
2059 return result;
2060 }
2062 return JNI_OK;
2063 }
2065 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2066 SysClassPath* scp_p,
2067 bool* scp_assembly_required_p,
2068 FlagValueOrigin origin) {
2069 // Remaining part of option string
2070 const char* tail;
2072 // iterate over arguments
2073 for (int index = 0; index < args->nOptions; index++) {
2074 bool is_absolute_path = false; // for -agentpath vs -agentlib
2076 const JavaVMOption* option = args->options + index;
2078 if (!match_option(option, "-Djava.class.path", &tail) &&
2079 !match_option(option, "-Dsun.java.command", &tail) &&
2080 !match_option(option, "-Dsun.java.launcher", &tail)) {
2082 // add all jvm options to the jvm_args string. This string
2083 // is used later to set the java.vm.args PerfData string constant.
2084 // the -Djava.class.path and the -Dsun.java.command options are
2085 // omitted from jvm_args string as each have their own PerfData
2086 // string constant object.
2087 build_jvm_args(option->optionString);
2088 }
2090 // -verbose:[class/gc/jni]
2091 if (match_option(option, "-verbose", &tail)) {
2092 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2093 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2094 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2095 } else if (!strcmp(tail, ":gc")) {
2096 FLAG_SET_CMDLINE(bool, PrintGC, true);
2097 } else if (!strcmp(tail, ":jni")) {
2098 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2099 }
2100 // -da / -ea / -disableassertions / -enableassertions
2101 // These accept an optional class/package name separated by a colon, e.g.,
2102 // -da:java.lang.Thread.
2103 } else if (match_option(option, user_assertion_options, &tail, true)) {
2104 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2105 if (*tail == '\0') {
2106 JavaAssertions::setUserClassDefault(enable);
2107 } else {
2108 assert(*tail == ':', "bogus match by match_option()");
2109 JavaAssertions::addOption(tail + 1, enable);
2110 }
2111 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2112 } else if (match_option(option, system_assertion_options, &tail, false)) {
2113 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2114 JavaAssertions::setSystemClassDefault(enable);
2115 // -bootclasspath:
2116 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2117 scp_p->reset_path(tail);
2118 *scp_assembly_required_p = true;
2119 // -bootclasspath/a:
2120 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2121 scp_p->add_suffix(tail);
2122 *scp_assembly_required_p = true;
2123 // -bootclasspath/p:
2124 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2125 scp_p->add_prefix(tail);
2126 *scp_assembly_required_p = true;
2127 // -Xrun
2128 } else if (match_option(option, "-Xrun", &tail)) {
2129 if (tail != NULL) {
2130 const char* pos = strchr(tail, ':');
2131 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2132 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2133 name[len] = '\0';
2135 char *options = NULL;
2136 if(pos != NULL) {
2137 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2138 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2139 }
2140 #ifdef JVMTI_KERNEL
2141 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2142 warning("profiling and debugging agents are not supported with Kernel VM");
2143 } else
2144 #endif // JVMTI_KERNEL
2145 add_init_library(name, options);
2146 }
2147 // -agentlib and -agentpath
2148 } else if (match_option(option, "-agentlib:", &tail) ||
2149 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2150 if(tail != NULL) {
2151 const char* pos = strchr(tail, '=');
2152 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2153 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2154 name[len] = '\0';
2156 char *options = NULL;
2157 if(pos != NULL) {
2158 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2159 }
2160 #ifdef JVMTI_KERNEL
2161 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2162 warning("profiling and debugging agents are not supported with Kernel VM");
2163 } else
2164 #endif // JVMTI_KERNEL
2165 add_init_agent(name, options, is_absolute_path);
2167 }
2168 // -javaagent
2169 } else if (match_option(option, "-javaagent:", &tail)) {
2170 if(tail != NULL) {
2171 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2172 add_init_agent("instrument", options, false);
2173 }
2174 // -Xnoclassgc
2175 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2176 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2177 // -Xincgc: i-CMS
2178 } else if (match_option(option, "-Xincgc", &tail)) {
2179 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2180 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2181 // -Xnoincgc: no i-CMS
2182 } else if (match_option(option, "-Xnoincgc", &tail)) {
2183 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2184 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2185 // -Xconcgc
2186 } else if (match_option(option, "-Xconcgc", &tail)) {
2187 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2188 // -Xnoconcgc
2189 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2190 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2191 // -Xbatch
2192 } else if (match_option(option, "-Xbatch", &tail)) {
2193 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2194 // -Xmn for compatibility with other JVM vendors
2195 } else if (match_option(option, "-Xmn", &tail)) {
2196 julong long_initial_eden_size = 0;
2197 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2198 if (errcode != arg_in_range) {
2199 jio_fprintf(defaultStream::error_stream(),
2200 "Invalid initial eden size: %s\n", option->optionString);
2201 describe_range_error(errcode);
2202 return JNI_EINVAL;
2203 }
2204 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2205 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2206 // -Xms
2207 } else if (match_option(option, "-Xms", &tail)) {
2208 julong long_initial_heap_size = 0;
2209 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2210 if (errcode != arg_in_range) {
2211 jio_fprintf(defaultStream::error_stream(),
2212 "Invalid initial heap size: %s\n", option->optionString);
2213 describe_range_error(errcode);
2214 return JNI_EINVAL;
2215 }
2216 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2217 // Currently the minimum size and the initial heap sizes are the same.
2218 set_min_heap_size(InitialHeapSize);
2219 // -Xmx
2220 } else if (match_option(option, "-Xmx", &tail)) {
2221 julong long_max_heap_size = 0;
2222 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2223 if (errcode != arg_in_range) {
2224 jio_fprintf(defaultStream::error_stream(),
2225 "Invalid maximum heap size: %s\n", option->optionString);
2226 describe_range_error(errcode);
2227 return JNI_EINVAL;
2228 }
2229 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2230 // Xmaxf
2231 } else if (match_option(option, "-Xmaxf", &tail)) {
2232 int maxf = (int)(atof(tail) * 100);
2233 if (maxf < 0 || maxf > 100) {
2234 jio_fprintf(defaultStream::error_stream(),
2235 "Bad max heap free percentage size: %s\n",
2236 option->optionString);
2237 return JNI_EINVAL;
2238 } else {
2239 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2240 }
2241 // Xminf
2242 } else if (match_option(option, "-Xminf", &tail)) {
2243 int minf = (int)(atof(tail) * 100);
2244 if (minf < 0 || minf > 100) {
2245 jio_fprintf(defaultStream::error_stream(),
2246 "Bad min heap free percentage size: %s\n",
2247 option->optionString);
2248 return JNI_EINVAL;
2249 } else {
2250 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2251 }
2252 // -Xss
2253 } else if (match_option(option, "-Xss", &tail)) {
2254 julong long_ThreadStackSize = 0;
2255 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2256 if (errcode != arg_in_range) {
2257 jio_fprintf(defaultStream::error_stream(),
2258 "Invalid thread stack size: %s\n", option->optionString);
2259 describe_range_error(errcode);
2260 return JNI_EINVAL;
2261 }
2262 // Internally track ThreadStackSize in units of 1024 bytes.
2263 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2264 round_to((int)long_ThreadStackSize, K) / K);
2265 // -Xoss
2266 } else if (match_option(option, "-Xoss", &tail)) {
2267 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2268 // -Xmaxjitcodesize
2269 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2270 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2271 julong long_ReservedCodeCacheSize = 0;
2272 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2273 (size_t)InitialCodeCacheSize);
2274 if (errcode != arg_in_range) {
2275 jio_fprintf(defaultStream::error_stream(),
2276 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2277 option->optionString, InitialCodeCacheSize/K);
2278 describe_range_error(errcode);
2279 return JNI_EINVAL;
2280 }
2281 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2282 // -green
2283 } else if (match_option(option, "-green", &tail)) {
2284 jio_fprintf(defaultStream::error_stream(),
2285 "Green threads support not available\n");
2286 return JNI_EINVAL;
2287 // -native
2288 } else if (match_option(option, "-native", &tail)) {
2289 // HotSpot always uses native threads, ignore silently for compatibility
2290 // -Xsqnopause
2291 } else if (match_option(option, "-Xsqnopause", &tail)) {
2292 // EVM option, ignore silently for compatibility
2293 // -Xrs
2294 } else if (match_option(option, "-Xrs", &tail)) {
2295 // Classic/EVM option, new functionality
2296 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2297 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2298 // change default internal VM signals used - lower case for back compat
2299 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2300 // -Xoptimize
2301 } else if (match_option(option, "-Xoptimize", &tail)) {
2302 // EVM option, ignore silently for compatibility
2303 // -Xprof
2304 } else if (match_option(option, "-Xprof", &tail)) {
2305 #ifndef FPROF_KERNEL
2306 _has_profile = true;
2307 #else // FPROF_KERNEL
2308 // do we have to exit?
2309 warning("Kernel VM does not support flat profiling.");
2310 #endif // FPROF_KERNEL
2311 // -Xaprof
2312 } else if (match_option(option, "-Xaprof", &tail)) {
2313 _has_alloc_profile = true;
2314 // -Xconcurrentio
2315 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2316 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2317 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2318 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2319 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2320 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2322 // -Xinternalversion
2323 } else if (match_option(option, "-Xinternalversion", &tail)) {
2324 jio_fprintf(defaultStream::output_stream(), "%s\n",
2325 VM_Version::internal_vm_info_string());
2326 vm_exit(0);
2327 #ifndef PRODUCT
2328 // -Xprintflags
2329 } else if (match_option(option, "-Xprintflags", &tail)) {
2330 CommandLineFlags::printFlags();
2331 vm_exit(0);
2332 #endif
2333 // -D
2334 } else if (match_option(option, "-D", &tail)) {
2335 if (!add_property(tail)) {
2336 return JNI_ENOMEM;
2337 }
2338 // Out of the box management support
2339 if (match_option(option, "-Dcom.sun.management", &tail)) {
2340 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2341 }
2342 // -Xint
2343 } else if (match_option(option, "-Xint", &tail)) {
2344 set_mode_flags(_int);
2345 // -Xmixed
2346 } else if (match_option(option, "-Xmixed", &tail)) {
2347 set_mode_flags(_mixed);
2348 // -Xcomp
2349 } else if (match_option(option, "-Xcomp", &tail)) {
2350 // for testing the compiler; turn off all flags that inhibit compilation
2351 set_mode_flags(_comp);
2353 // -Xshare:dump
2354 } else if (match_option(option, "-Xshare:dump", &tail)) {
2355 #ifdef TIERED
2356 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2357 set_mode_flags(_int); // Prevent compilation, which creates objects
2358 #elif defined(COMPILER2)
2359 vm_exit_during_initialization(
2360 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2361 #elif defined(KERNEL)
2362 vm_exit_during_initialization(
2363 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2364 #else
2365 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2366 set_mode_flags(_int); // Prevent compilation, which creates objects
2367 #endif
2368 // -Xshare:on
2369 } else if (match_option(option, "-Xshare:on", &tail)) {
2370 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2371 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2372 // -Xshare:auto
2373 } else if (match_option(option, "-Xshare:auto", &tail)) {
2374 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2375 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2376 // -Xshare:off
2377 } else if (match_option(option, "-Xshare:off", &tail)) {
2378 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2379 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2381 // -Xverify
2382 } else if (match_option(option, "-Xverify", &tail)) {
2383 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2384 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2385 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2386 } else if (strcmp(tail, ":remote") == 0) {
2387 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2388 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2389 } else if (strcmp(tail, ":none") == 0) {
2390 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2391 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2392 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2393 return JNI_EINVAL;
2394 }
2395 // -Xdebug
2396 } else if (match_option(option, "-Xdebug", &tail)) {
2397 // note this flag has been used, then ignore
2398 set_xdebug_mode(true);
2399 // -Xnoagent
2400 } else if (match_option(option, "-Xnoagent", &tail)) {
2401 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2402 } else if (match_option(option, "-Xboundthreads", &tail)) {
2403 // Bind user level threads to kernel threads (Solaris only)
2404 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2405 } else if (match_option(option, "-Xloggc:", &tail)) {
2406 // Redirect GC output to the file. -Xloggc:<filename>
2407 // ostream_init_log(), when called will use this filename
2408 // to initialize a fileStream.
2409 _gc_log_filename = strdup(tail);
2410 FLAG_SET_CMDLINE(bool, PrintGC, true);
2411 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2413 // JNI hooks
2414 } else if (match_option(option, "-Xcheck", &tail)) {
2415 if (!strcmp(tail, ":jni")) {
2416 CheckJNICalls = true;
2417 } else if (is_bad_option(option, args->ignoreUnrecognized,
2418 "check")) {
2419 return JNI_EINVAL;
2420 }
2421 } else if (match_option(option, "vfprintf", &tail)) {
2422 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2423 } else if (match_option(option, "exit", &tail)) {
2424 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2425 } else if (match_option(option, "abort", &tail)) {
2426 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2427 // -XX:+AggressiveHeap
2428 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2430 // This option inspects the machine and attempts to set various
2431 // parameters to be optimal for long-running, memory allocation
2432 // intensive jobs. It is intended for machines with large
2433 // amounts of cpu and memory.
2435 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2436 // VM, but we may not be able to represent the total physical memory
2437 // available (like having 8gb of memory on a box but using a 32bit VM).
2438 // Thus, we need to make sure we're using a julong for intermediate
2439 // calculations.
2440 julong initHeapSize;
2441 julong total_memory = os::physical_memory();
2443 if (total_memory < (julong)256*M) {
2444 jio_fprintf(defaultStream::error_stream(),
2445 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2446 vm_exit(1);
2447 }
2449 // The heap size is half of available memory, or (at most)
2450 // all of possible memory less 160mb (leaving room for the OS
2451 // when using ISM). This is the maximum; because adaptive sizing
2452 // is turned on below, the actual space used may be smaller.
2454 initHeapSize = MIN2(total_memory / (julong)2,
2455 total_memory - (julong)160*M);
2457 // Make sure that if we have a lot of memory we cap the 32 bit
2458 // process space. The 64bit VM version of this function is a nop.
2459 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2461 // The perm gen is separate but contiguous with the
2462 // object heap (and is reserved with it) so subtract it
2463 // from the heap size.
2464 if (initHeapSize > MaxPermSize) {
2465 initHeapSize = initHeapSize - MaxPermSize;
2466 } else {
2467 warning("AggressiveHeap and MaxPermSize values may conflict");
2468 }
2470 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2471 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2472 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2473 // Currently the minimum size and the initial heap sizes are the same.
2474 set_min_heap_size(initHeapSize);
2475 }
2476 if (FLAG_IS_DEFAULT(NewSize)) {
2477 // Make the young generation 3/8ths of the total heap.
2478 FLAG_SET_CMDLINE(uintx, NewSize,
2479 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2480 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2481 }
2483 FLAG_SET_DEFAULT(UseLargePages, true);
2485 // Increase some data structure sizes for efficiency
2486 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2487 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2488 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2490 // See the OldPLABSize comment below, but replace 'after promotion'
2491 // with 'after copying'. YoungPLABSize is the size of the survivor
2492 // space per-gc-thread buffers. The default is 4kw.
2493 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2495 // OldPLABSize is the size of the buffers in the old gen that
2496 // UseParallelGC uses to promote live data that doesn't fit in the
2497 // survivor spaces. At any given time, there's one for each gc thread.
2498 // The default size is 1kw. These buffers are rarely used, since the
2499 // survivor spaces are usually big enough. For specjbb, however, there
2500 // are occasions when there's lots of live data in the young gen
2501 // and we end up promoting some of it. We don't have a definite
2502 // explanation for why bumping OldPLABSize helps, but the theory
2503 // is that a bigger PLAB results in retaining something like the
2504 // original allocation order after promotion, which improves mutator
2505 // locality. A minor effect may be that larger PLABs reduce the
2506 // number of PLAB allocation events during gc. The value of 8kw
2507 // was arrived at by experimenting with specjbb.
2508 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2510 // CompilationPolicyChoice=0 causes the server compiler to adopt
2511 // a more conservative which-method-do-I-compile policy when one
2512 // of the counters maintained by the interpreter trips. The
2513 // result is reduced startup time and improved specjbb and
2514 // alacrity performance. Zero is the default, but we set it
2515 // explicitly here in case the default changes.
2516 // See runtime/compilationPolicy.*.
2517 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2519 // Enable parallel GC and adaptive generation sizing
2520 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2521 FLAG_SET_DEFAULT(ParallelGCThreads,
2522 Abstract_VM_Version::parallel_worker_threads());
2524 // Encourage steady state memory management
2525 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2527 // This appears to improve mutator locality
2528 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2530 // Get around early Solaris scheduling bug
2531 // (affinity vs other jobs on system)
2532 // but disallow DR and offlining (5008695).
2533 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2535 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2536 // The last option must always win.
2537 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2538 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2539 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2540 // The last option must always win.
2541 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2542 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2543 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2544 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2545 jio_fprintf(defaultStream::error_stream(),
2546 "Please use CMSClassUnloadingEnabled in place of "
2547 "CMSPermGenSweepingEnabled in the future\n");
2548 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2549 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2550 jio_fprintf(defaultStream::error_stream(),
2551 "Please use -XX:+UseGCOverheadLimit in place of "
2552 "-XX:+UseGCTimeLimit in the future\n");
2553 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2554 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2555 jio_fprintf(defaultStream::error_stream(),
2556 "Please use -XX:-UseGCOverheadLimit in place of "
2557 "-XX:-UseGCTimeLimit in the future\n");
2558 // The TLE options are for compatibility with 1.3 and will be
2559 // removed without notice in a future release. These options
2560 // are not to be documented.
2561 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2562 // No longer used.
2563 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2564 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2565 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2566 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2567 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2568 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2569 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2570 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2571 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2572 // No longer used.
2573 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2574 julong long_tlab_size = 0;
2575 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2576 if (errcode != arg_in_range) {
2577 jio_fprintf(defaultStream::error_stream(),
2578 "Invalid TLAB size: %s\n", option->optionString);
2579 describe_range_error(errcode);
2580 return JNI_EINVAL;
2581 }
2582 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2583 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2584 // No longer used.
2585 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2586 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2587 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2588 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2589 SOLARIS_ONLY(
2590 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2591 warning("-XX:+UsePermISM is obsolete.");
2592 FLAG_SET_CMDLINE(bool, UseISM, true);
2593 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2594 FLAG_SET_CMDLINE(bool, UseISM, false);
2595 )
2596 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2597 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2598 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2599 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2600 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2601 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2602 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2603 #ifdef SOLARIS
2604 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2605 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2606 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2607 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2608 #else // ndef SOLARIS
2609 jio_fprintf(defaultStream::error_stream(),
2610 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2611 return JNI_EINVAL;
2612 #endif // ndef SOLARIS
2613 #ifdef ASSERT
2614 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2615 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2616 // disable scavenge before parallel mark-compact
2617 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2618 #endif
2619 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2620 julong cms_blocks_to_claim = (julong)atol(tail);
2621 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2622 jio_fprintf(defaultStream::error_stream(),
2623 "Please use -XX:OldPLABSize in place of "
2624 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2625 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2626 julong cms_blocks_to_claim = (julong)atol(tail);
2627 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2628 jio_fprintf(defaultStream::error_stream(),
2629 "Please use -XX:OldPLABSize in place of "
2630 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2631 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2632 julong old_plab_size = 0;
2633 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2634 if (errcode != arg_in_range) {
2635 jio_fprintf(defaultStream::error_stream(),
2636 "Invalid old PLAB size: %s\n", option->optionString);
2637 describe_range_error(errcode);
2638 return JNI_EINVAL;
2639 }
2640 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2641 jio_fprintf(defaultStream::error_stream(),
2642 "Please use -XX:OldPLABSize in place of "
2643 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2644 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2645 julong young_plab_size = 0;
2646 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2647 if (errcode != arg_in_range) {
2648 jio_fprintf(defaultStream::error_stream(),
2649 "Invalid young PLAB size: %s\n", option->optionString);
2650 describe_range_error(errcode);
2651 return JNI_EINVAL;
2652 }
2653 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2654 jio_fprintf(defaultStream::error_stream(),
2655 "Please use -XX:YoungPLABSize in place of "
2656 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2657 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2658 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2659 julong stack_size = 0;
2660 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2661 if (errcode != arg_in_range) {
2662 jio_fprintf(defaultStream::error_stream(),
2663 "Invalid mark stack size: %s\n", option->optionString);
2664 describe_range_error(errcode);
2665 return JNI_EINVAL;
2666 }
2667 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2668 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2669 julong max_stack_size = 0;
2670 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2671 if (errcode != arg_in_range) {
2672 jio_fprintf(defaultStream::error_stream(),
2673 "Invalid maximum mark stack size: %s\n",
2674 option->optionString);
2675 describe_range_error(errcode);
2676 return JNI_EINVAL;
2677 }
2678 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2679 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2680 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2681 uintx conc_threads = 0;
2682 if (!parse_uintx(tail, &conc_threads, 1)) {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Invalid concurrent threads: %s\n", option->optionString);
2685 return JNI_EINVAL;
2686 }
2687 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2688 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2689 // Skip -XX:Flags= since that case has already been handled
2690 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2691 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2692 return JNI_EINVAL;
2693 }
2694 }
2695 // Unknown option
2696 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2697 return JNI_ERR;
2698 }
2699 }
2701 // Change the default value for flags which have different default values
2702 // when working with older JDKs.
2703 if (JDK_Version::current().compare_major(6) <= 0 &&
2704 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2705 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2706 }
2707 #ifdef LINUX
2708 if (JDK_Version::current().compare_major(6) <= 0 &&
2709 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2710 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2711 }
2712 #endif // LINUX
2713 return JNI_OK;
2714 }
2716 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2717 // This must be done after all -D arguments have been processed.
2718 scp_p->expand_endorsed();
2720 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2721 // Assemble the bootclasspath elements into the final path.
2722 Arguments::set_sysclasspath(scp_p->combined_path());
2723 }
2725 // This must be done after all arguments have been processed.
2726 // java_compiler() true means set to "NONE" or empty.
2727 if (java_compiler() && !xdebug_mode()) {
2728 // For backwards compatibility, we switch to interpreted mode if
2729 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2730 // not specified.
2731 set_mode_flags(_int);
2732 }
2733 if (CompileThreshold == 0) {
2734 set_mode_flags(_int);
2735 }
2737 #ifndef COMPILER2
2738 // Don't degrade server performance for footprint
2739 if (FLAG_IS_DEFAULT(UseLargePages) &&
2740 MaxHeapSize < LargePageHeapSizeThreshold) {
2741 // No need for large granularity pages w/small heaps.
2742 // Note that large pages are enabled/disabled for both the
2743 // Java heap and the code cache.
2744 FLAG_SET_DEFAULT(UseLargePages, false);
2745 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2746 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2747 }
2749 // Tiered compilation is undefined with C1.
2750 TieredCompilation = false;
2751 #else
2752 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2753 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2754 }
2755 #endif
2757 // If we are running in a headless jre, force java.awt.headless property
2758 // to be true unless the property has already been set.
2759 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2760 if (os::is_headless_jre()) {
2761 const char* headless = Arguments::get_property("java.awt.headless");
2762 if (headless == NULL) {
2763 char envbuffer[128];
2764 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2765 if (!add_property("java.awt.headless=true")) {
2766 return JNI_ENOMEM;
2767 }
2768 } else {
2769 char buffer[256];
2770 strcpy(buffer, "java.awt.headless=");
2771 strcat(buffer, envbuffer);
2772 if (!add_property(buffer)) {
2773 return JNI_ENOMEM;
2774 }
2775 }
2776 }
2777 }
2779 if (!check_vm_args_consistency()) {
2780 return JNI_ERR;
2781 }
2783 return JNI_OK;
2784 }
2786 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2787 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2788 scp_assembly_required_p);
2789 }
2791 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2792 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2793 scp_assembly_required_p);
2794 }
2796 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2797 const int N_MAX_OPTIONS = 64;
2798 const int OPTION_BUFFER_SIZE = 1024;
2799 char buffer[OPTION_BUFFER_SIZE];
2801 // The variable will be ignored if it exceeds the length of the buffer.
2802 // Don't check this variable if user has special privileges
2803 // (e.g. unix su command).
2804 if (os::getenv(name, buffer, sizeof(buffer)) &&
2805 !os::have_special_privileges()) {
2806 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Picked up %s: %s\n", name, buffer);
2809 char* rd = buffer; // pointer to the input string (rd)
2810 int i;
2811 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2812 while (isspace(*rd)) rd++; // skip whitespace
2813 if (*rd == 0) break; // we re done when the input string is read completely
2815 // The output, option string, overwrites the input string.
2816 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2817 // input string (rd).
2818 char* wrt = rd;
2820 options[i++].optionString = wrt; // Fill in option
2821 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2822 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2823 int quote = *rd; // matching quote to look for
2824 rd++; // don't copy open quote
2825 while (*rd != quote) { // include everything (even spaces) up until quote
2826 if (*rd == 0) { // string termination means unmatched string
2827 jio_fprintf(defaultStream::error_stream(),
2828 "Unmatched quote in %s\n", name);
2829 return JNI_ERR;
2830 }
2831 *wrt++ = *rd++; // copy to option string
2832 }
2833 rd++; // don't copy close quote
2834 } else {
2835 *wrt++ = *rd++; // copy to option string
2836 }
2837 }
2838 // Need to check if we're done before writing a NULL,
2839 // because the write could be to the byte that rd is pointing to.
2840 if (*rd++ == 0) {
2841 *wrt = 0;
2842 break;
2843 }
2844 *wrt = 0; // Zero terminate option
2845 }
2846 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2847 JavaVMInitArgs vm_args;
2848 vm_args.version = JNI_VERSION_1_2;
2849 vm_args.options = options;
2850 vm_args.nOptions = i;
2851 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2853 if (PrintVMOptions) {
2854 const char* tail;
2855 for (int i = 0; i < vm_args.nOptions; i++) {
2856 const JavaVMOption *option = vm_args.options + i;
2857 if (match_option(option, "-XX:", &tail)) {
2858 logOption(tail);
2859 }
2860 }
2861 }
2863 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2864 }
2865 return JNI_OK;
2866 }
2868 void Arguments::set_shared_spaces_flags() {
2869 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2870 const bool might_share = must_share || UseSharedSpaces;
2872 // The string table is part of the shared archive so the size must match.
2873 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2874 // Disable sharing.
2875 if (must_share) {
2876 warning("disabling shared archive %s because of non-default "
2877 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2878 }
2879 if (might_share) {
2880 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2881 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2882 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2883 }
2884 return;
2885 }
2887 // Check whether class data sharing settings conflict with GC, compressed oops
2888 // or page size, and fix them up. Explicit sharing options override other
2889 // settings.
2890 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2891 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2892 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2893 if (cannot_share) {
2894 if (must_share) {
2895 warning("selecting serial gc and disabling large pages %s"
2896 "because of %s", "" LP64_ONLY("and compressed oops "),
2897 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2898 force_serial_gc();
2899 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2900 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2901 } else {
2902 if (UseSharedSpaces && Verbose) {
2903 warning("turning off use of shared archive because of "
2904 "choice of garbage collector or large pages");
2905 }
2906 no_shared_spaces();
2907 }
2908 } else if (UseLargePages && might_share) {
2909 // Disable large pages to allow shared spaces. This is sub-optimal, since
2910 // there may not even be a shared archive to use.
2911 FLAG_SET_DEFAULT(UseLargePages, false);
2912 }
2913 }
2915 // Parse entry point called from JNI_CreateJavaVM
2917 jint Arguments::parse(const JavaVMInitArgs* args) {
2919 // Sharing support
2920 // Construct the path to the archive
2921 char jvm_path[JVM_MAXPATHLEN];
2922 os::jvm_path(jvm_path, sizeof(jvm_path));
2923 #ifdef TIERED
2924 if (strstr(jvm_path, "client") != NULL) {
2925 force_client_mode = true;
2926 }
2927 #endif // TIERED
2928 char *end = strrchr(jvm_path, *os::file_separator());
2929 if (end != NULL) *end = '\0';
2930 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2931 strlen(os::file_separator()) + 20);
2932 if (shared_archive_path == NULL) return JNI_ENOMEM;
2933 strcpy(shared_archive_path, jvm_path);
2934 strcat(shared_archive_path, os::file_separator());
2935 strcat(shared_archive_path, "classes");
2936 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2937 strcat(shared_archive_path, ".jsa");
2938 SharedArchivePath = shared_archive_path;
2940 // Remaining part of option string
2941 const char* tail;
2943 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2944 bool settings_file_specified = false;
2945 const char* flags_file;
2946 int index;
2947 for (index = 0; index < args->nOptions; index++) {
2948 const JavaVMOption *option = args->options + index;
2949 if (match_option(option, "-XX:Flags=", &tail)) {
2950 flags_file = tail;
2951 settings_file_specified = true;
2952 }
2953 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2954 PrintVMOptions = true;
2955 }
2956 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2957 PrintVMOptions = false;
2958 }
2959 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2960 IgnoreUnrecognizedVMOptions = true;
2961 }
2962 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2963 IgnoreUnrecognizedVMOptions = false;
2964 }
2965 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2966 CommandLineFlags::printFlags();
2967 vm_exit(0);
2968 }
2970 #ifndef PRODUCT
2971 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2972 CommandLineFlags::printFlags(true);
2973 vm_exit(0);
2974 }
2975 #endif
2976 }
2978 if (IgnoreUnrecognizedVMOptions) {
2979 // uncast const to modify the flag args->ignoreUnrecognized
2980 *(jboolean*)(&args->ignoreUnrecognized) = true;
2981 }
2983 // Parse specified settings file
2984 if (settings_file_specified) {
2985 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2986 return JNI_EINVAL;
2987 }
2988 }
2990 // Parse default .hotspotrc settings file
2991 if (!settings_file_specified) {
2992 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2993 return JNI_EINVAL;
2994 }
2995 }
2997 if (PrintVMOptions) {
2998 for (index = 0; index < args->nOptions; index++) {
2999 const JavaVMOption *option = args->options + index;
3000 if (match_option(option, "-XX:", &tail)) {
3001 logOption(tail);
3002 }
3003 }
3004 }
3006 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3007 jint result = parse_vm_init_args(args);
3008 if (result != JNI_OK) {
3009 return result;
3010 }
3012 #ifndef PRODUCT
3013 if (TraceBytecodesAt != 0) {
3014 TraceBytecodes = true;
3015 }
3016 if (CountCompiledCalls) {
3017 if (UseCounterDecay) {
3018 warning("UseCounterDecay disabled because CountCalls is set");
3019 UseCounterDecay = false;
3020 }
3021 }
3022 #endif // PRODUCT
3024 // Transitional
3025 if (EnableMethodHandles || AnonymousClasses) {
3026 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3027 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
3028 } else {
3029 EnableInvokeDynamic = true;
3030 }
3031 }
3033 // JSR 292 is not supported before 1.7
3034 if (!JDK_Version::is_gte_jdk17x_version()) {
3035 if (EnableInvokeDynamic) {
3036 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3037 warning("JSR 292 is not supported before 1.7. Disabling support.");
3038 }
3039 EnableInvokeDynamic = false;
3040 }
3041 }
3043 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3044 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3045 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3046 }
3047 ScavengeRootsInCode = 1;
3048 }
3049 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3050 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3051 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3052 }
3053 ScavengeRootsInCode = 1;
3054 }
3056 if (PrintGCDetails) {
3057 // Turn on -verbose:gc options as well
3058 PrintGC = true;
3059 }
3061 // Set object alignment values.
3062 set_object_alignment();
3064 #ifdef SERIALGC
3065 force_serial_gc();
3066 #endif // SERIALGC
3067 #ifdef KERNEL
3068 no_shared_spaces();
3069 #endif // KERNEL
3071 // Set flags based on ergonomics.
3072 set_ergonomics_flags();
3074 set_shared_spaces_flags();
3076 // Check the GC selections again.
3077 if (!check_gc_consistency()) {
3078 return JNI_EINVAL;
3079 }
3081 if (TieredCompilation) {
3082 set_tiered_flags();
3083 } else {
3084 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3085 if (CompilationPolicyChoice >= 2) {
3086 vm_exit_during_initialization(
3087 "Incompatible compilation policy selected", NULL);
3088 }
3089 }
3091 #ifndef KERNEL
3092 // Set heap size based on available physical memory
3093 set_heap_size();
3094 // Set per-collector flags
3095 if (UseParallelGC || UseParallelOldGC) {
3096 set_parallel_gc_flags();
3097 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3098 set_cms_and_parnew_gc_flags();
3099 } else if (UseParNewGC) { // skipped if CMS is set above
3100 set_parnew_gc_flags();
3101 } else if (UseG1GC) {
3102 set_g1_gc_flags();
3103 }
3104 #endif // KERNEL
3106 #ifdef SERIALGC
3107 assert(verify_serial_gc_flags(), "SerialGC unset");
3108 #endif // SERIALGC
3110 // Set bytecode rewriting flags
3111 set_bytecode_flags();
3113 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3114 set_aggressive_opts_flags();
3116 // Turn off biased locking for locking debug mode flags,
3117 // which are subtlely different from each other but neither works with
3118 // biased locking.
3119 if (UseHeavyMonitors
3120 #ifdef COMPILER1
3121 || !UseFastLocking
3122 #endif // COMPILER1
3123 ) {
3124 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3125 // flag set to true on command line; warn the user that they
3126 // can't enable biased locking here
3127 warning("Biased Locking is not supported with locking debug flags"
3128 "; ignoring UseBiasedLocking flag." );
3129 }
3130 UseBiasedLocking = false;
3131 }
3133 #ifdef CC_INTERP
3134 // Clear flags not supported by the C++ interpreter
3135 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3136 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3137 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3138 #endif // CC_INTERP
3140 #ifdef COMPILER2
3141 if (!UseBiasedLocking || EmitSync != 0) {
3142 UseOptoBiasInlining = false;
3143 }
3144 #endif
3146 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3147 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3148 DebugNonSafepoints = true;
3149 }
3151 #ifndef PRODUCT
3152 if (CompileTheWorld) {
3153 // Force NmethodSweeper to sweep whole CodeCache each time.
3154 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3155 NmethodSweepFraction = 1;
3156 }
3157 }
3158 #endif
3160 if (PrintCommandLineFlags) {
3161 CommandLineFlags::printSetFlags();
3162 }
3164 // Apply CPU specific policy for the BiasedLocking
3165 if (UseBiasedLocking) {
3166 if (!VM_Version::use_biased_locking() &&
3167 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3168 UseBiasedLocking = false;
3169 }
3170 }
3172 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3173 // but only if not already set on the commandline
3174 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3175 bool set = false;
3176 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3177 if (!set) {
3178 FLAG_SET_DEFAULT(PauseAtExit, true);
3179 }
3180 }
3182 return JNI_OK;
3183 }
3185 int Arguments::PropertyList_count(SystemProperty* pl) {
3186 int count = 0;
3187 while(pl != NULL) {
3188 count++;
3189 pl = pl->next();
3190 }
3191 return count;
3192 }
3194 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3195 assert(key != NULL, "just checking");
3196 SystemProperty* prop;
3197 for (prop = pl; prop != NULL; prop = prop->next()) {
3198 if (strcmp(key, prop->key()) == 0) return prop->value();
3199 }
3200 return NULL;
3201 }
3203 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3204 int count = 0;
3205 const char* ret_val = NULL;
3207 while(pl != NULL) {
3208 if(count >= index) {
3209 ret_val = pl->key();
3210 break;
3211 }
3212 count++;
3213 pl = pl->next();
3214 }
3216 return ret_val;
3217 }
3219 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3220 int count = 0;
3221 char* ret_val = NULL;
3223 while(pl != NULL) {
3224 if(count >= index) {
3225 ret_val = pl->value();
3226 break;
3227 }
3228 count++;
3229 pl = pl->next();
3230 }
3232 return ret_val;
3233 }
3235 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3236 SystemProperty* p = *plist;
3237 if (p == NULL) {
3238 *plist = new_p;
3239 } else {
3240 while (p->next() != NULL) {
3241 p = p->next();
3242 }
3243 p->set_next(new_p);
3244 }
3245 }
3247 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3248 if (plist == NULL)
3249 return;
3251 SystemProperty* new_p = new SystemProperty(k, v, true);
3252 PropertyList_add(plist, new_p);
3253 }
3255 // This add maintains unique property key in the list.
3256 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3257 if (plist == NULL)
3258 return;
3260 // If property key exist then update with new value.
3261 SystemProperty* prop;
3262 for (prop = *plist; prop != NULL; prop = prop->next()) {
3263 if (strcmp(k, prop->key()) == 0) {
3264 if (append) {
3265 prop->append_value(v);
3266 } else {
3267 prop->set_value(v);
3268 }
3269 return;
3270 }
3271 }
3273 PropertyList_add(plist, k, v);
3274 }
3276 #ifdef KERNEL
3277 char *Arguments::get_kernel_properties() {
3278 // Find properties starting with kernel and append them to string
3279 // We need to find out how long they are first because the URL's that they
3280 // might point to could get long.
3281 int length = 0;
3282 SystemProperty* prop;
3283 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3284 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3285 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3286 }
3287 }
3288 // Add one for null terminator.
3289 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3290 if (length != 0) {
3291 int pos = 0;
3292 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3293 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3294 jio_snprintf(&props[pos], length-pos,
3295 "-D%s=%s ", prop->key(), prop->value());
3296 pos = strlen(props);
3297 }
3298 }
3299 }
3300 // null terminate props in case of null
3301 props[length] = '\0';
3302 return props;
3303 }
3304 #endif // KERNEL
3306 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3307 // Returns true if all of the source pointed by src has been copied over to
3308 // the destination buffer pointed by buf. Otherwise, returns false.
3309 // Notes:
3310 // 1. If the length (buflen) of the destination buffer excluding the
3311 // NULL terminator character is not long enough for holding the expanded
3312 // pid characters, it also returns false instead of returning the partially
3313 // expanded one.
3314 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3315 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3316 char* buf, size_t buflen) {
3317 const char* p = src;
3318 char* b = buf;
3319 const char* src_end = &src[srclen];
3320 char* buf_end = &buf[buflen - 1];
3322 while (p < src_end && b < buf_end) {
3323 if (*p == '%') {
3324 switch (*(++p)) {
3325 case '%': // "%%" ==> "%"
3326 *b++ = *p++;
3327 break;
3328 case 'p': { // "%p" ==> current process id
3329 // buf_end points to the character before the last character so
3330 // that we could write '\0' to the end of the buffer.
3331 size_t buf_sz = buf_end - b + 1;
3332 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3334 // if jio_snprintf fails or the buffer is not long enough to hold
3335 // the expanded pid, returns false.
3336 if (ret < 0 || ret >= (int)buf_sz) {
3337 return false;
3338 } else {
3339 b += ret;
3340 assert(*b == '\0', "fail in copy_expand_pid");
3341 if (p == src_end && b == buf_end + 1) {
3342 // reach the end of the buffer.
3343 return true;
3344 }
3345 }
3346 p++;
3347 break;
3348 }
3349 default :
3350 *b++ = '%';
3351 }
3352 } else {
3353 *b++ = *p++;
3354 }
3355 }
3356 *b = '\0';
3357 return (p == src_end); // return false if not all of the source was copied
3358 }