Thu, 20 Jan 2011 08:25:22 -0800
7011839: JSR 292 turn on escape analysis when using invokedynamic
Summary: Currently escape analysis is turned off when EnableInvokeDynamic is true.
Reviewed-by: jrose, kvn
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 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
63 #define DEFAULT_JAVA_LAUNCHER "generic"
65 char** Arguments::_jvm_flags_array = NULL;
66 int Arguments::_num_jvm_flags = 0;
67 char** Arguments::_jvm_args_array = NULL;
68 int Arguments::_num_jvm_args = 0;
69 char* Arguments::_java_command = NULL;
70 SystemProperty* Arguments::_system_properties = NULL;
71 const char* Arguments::_gc_log_filename = NULL;
72 bool Arguments::_has_profile = false;
73 bool Arguments::_has_alloc_profile = false;
74 uintx Arguments::_min_heap_size = 0;
75 Arguments::Mode Arguments::_mode = _mixed;
76 bool Arguments::_java_compiler = false;
77 bool Arguments::_xdebug_mode = false;
78 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
79 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
80 int Arguments::_sun_java_launcher_pid = -1;
82 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
83 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
84 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
85 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
86 bool Arguments::_ClipInlining = ClipInlining;
88 char* Arguments::SharedArchivePath = NULL;
90 AgentLibraryList Arguments::_libraryList;
91 AgentLibraryList Arguments::_agentList;
93 abort_hook_t Arguments::_abort_hook = NULL;
94 exit_hook_t Arguments::_exit_hook = NULL;
95 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
98 SystemProperty *Arguments::_java_ext_dirs = NULL;
99 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
100 SystemProperty *Arguments::_sun_boot_library_path = NULL;
101 SystemProperty *Arguments::_java_library_path = NULL;
102 SystemProperty *Arguments::_java_home = NULL;
103 SystemProperty *Arguments::_java_class_path = NULL;
104 SystemProperty *Arguments::_sun_boot_class_path = NULL;
106 char* Arguments::_meta_index_path = NULL;
107 char* Arguments::_meta_index_dir = NULL;
109 static bool force_client_mode = false;
111 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
113 static bool match_option(const JavaVMOption *option, const char* name,
114 const char** tail) {
115 int len = (int)strlen(name);
116 if (strncmp(option->optionString, name, len) == 0) {
117 *tail = option->optionString + len;
118 return true;
119 } else {
120 return false;
121 }
122 }
124 static void logOption(const char* opt) {
125 if (PrintVMOptions) {
126 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
127 }
128 }
130 // Process java launcher properties.
131 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
132 // See if sun.java.launcher or sun.java.launcher.pid is defined.
133 // Must do this before setting up other system properties,
134 // as some of them may depend on launcher type.
135 for (int index = 0; index < args->nOptions; index++) {
136 const JavaVMOption* option = args->options + index;
137 const char* tail;
139 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
140 process_java_launcher_argument(tail, option->extraInfo);
141 continue;
142 }
143 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
144 _sun_java_launcher_pid = atoi(tail);
145 continue;
146 }
147 }
148 }
150 // Initialize system properties key and value.
151 void Arguments::init_system_properties() {
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
154 "Java Virtual Machine Specification", false));
155 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
156 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
157 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
159 // following are JVMTI agent writeable properties.
160 // Properties values are set to NULL and they are
161 // os specific they are initialized in os::init_system_properties_values().
162 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
163 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
164 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
165 _java_library_path = new SystemProperty("java.library.path", NULL, true);
166 _java_home = new SystemProperty("java.home", NULL, true);
167 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
169 _java_class_path = new SystemProperty("java.class.path", "", true);
171 // Add to System Property list.
172 PropertyList_add(&_system_properties, _java_ext_dirs);
173 PropertyList_add(&_system_properties, _java_endorsed_dirs);
174 PropertyList_add(&_system_properties, _sun_boot_library_path);
175 PropertyList_add(&_system_properties, _java_library_path);
176 PropertyList_add(&_system_properties, _java_home);
177 PropertyList_add(&_system_properties, _java_class_path);
178 PropertyList_add(&_system_properties, _sun_boot_class_path);
180 // Set OS specific system properties values
181 os::init_system_properties_values();
182 }
185 // Update/Initialize System properties after JDK version number is known
186 void Arguments::init_version_specific_system_properties() {
187 enum { bufsz = 16 };
188 char buffer[bufsz];
189 const char* spec_vendor = "Sun Microsystems Inc.";
190 uint32_t spec_version = 0;
192 if (JDK_Version::is_gte_jdk17x_version()) {
193 spec_vendor = "Oracle Corporation";
194 spec_version = JDK_Version::current().major_version();
195 }
196 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
198 PropertyList_add(&_system_properties,
199 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
200 PropertyList_add(&_system_properties,
201 new SystemProperty("java.vm.specification.version", buffer, false));
202 PropertyList_add(&_system_properties,
203 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
204 }
206 /**
207 * Provide a slightly more user-friendly way of eliminating -XX flags.
208 * When a flag is eliminated, it can be added to this list in order to
209 * continue accepting this flag on the command-line, while issuing a warning
210 * and ignoring the value. Once the JDK version reaches the 'accept_until'
211 * limit, we flatly refuse to admit the existence of the flag. This allows
212 * a flag to die correctly over JDK releases using HSX.
213 */
214 typedef struct {
215 const char* name;
216 JDK_Version obsoleted_in; // when the flag went away
217 JDK_Version accept_until; // which version to start denying the existence
218 } ObsoleteFlag;
220 static ObsoleteFlag obsolete_jvm_flags[] = {
221 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
232 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
233 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
234 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
235 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
236 { "DefaultInitialRAMFraction",
237 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
238 { "UseDepthFirstScavengeOrder",
239 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
240 { "HandlePromotionFailure",
241 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
242 { "MaxLiveObjectEvacuationRatio",
243 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
244 { NULL, JDK_Version(0), JDK_Version(0) }
245 };
247 // Returns true if the flag is obsolete and fits into the range specified
248 // for being ignored. In the case that the flag is ignored, the 'version'
249 // value is filled in with the version number when the flag became
250 // obsolete so that that value can be displayed to the user.
251 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
252 int i = 0;
253 assert(version != NULL, "Must provide a version buffer");
254 while (obsolete_jvm_flags[i].name != NULL) {
255 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
256 // <flag>=xxx form
257 // [-|+]<flag> form
258 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
259 ((s[0] == '+' || s[0] == '-') &&
260 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
261 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
262 *version = flag_status.obsoleted_in;
263 return true;
264 }
265 }
266 i++;
267 }
268 return false;
269 }
271 // Constructs the system class path (aka boot class path) from the following
272 // components, in order:
273 //
274 // prefix // from -Xbootclasspath/p:...
275 // endorsed // the expansion of -Djava.endorsed.dirs=...
276 // base // from os::get_system_properties() or -Xbootclasspath=
277 // suffix // from -Xbootclasspath/a:...
278 //
279 // java.endorsed.dirs is a list of directories; any jar or zip files in the
280 // directories are added to the sysclasspath just before the base.
281 //
282 // This could be AllStatic, but it isn't needed after argument processing is
283 // complete.
284 class SysClassPath: public StackObj {
285 public:
286 SysClassPath(const char* base);
287 ~SysClassPath();
289 inline void set_base(const char* base);
290 inline void add_prefix(const char* prefix);
291 inline void add_suffix_to_prefix(const char* suffix);
292 inline void add_suffix(const char* suffix);
293 inline void reset_path(const char* base);
295 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
296 // property. Must be called after all command-line arguments have been
297 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
298 // combined_path().
299 void expand_endorsed();
301 inline const char* get_base() const { return _items[_scp_base]; }
302 inline const char* get_prefix() const { return _items[_scp_prefix]; }
303 inline const char* get_suffix() const { return _items[_scp_suffix]; }
304 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
306 // Combine all the components into a single c-heap-allocated string; caller
307 // must free the string if/when no longer needed.
308 char* combined_path();
310 private:
311 // Utility routines.
312 static char* add_to_path(const char* path, const char* str, bool prepend);
313 static char* add_jars_to_path(char* path, const char* directory);
315 inline void reset_item_at(int index);
317 // Array indices for the items that make up the sysclasspath. All except the
318 // base are allocated in the C heap and freed by this class.
319 enum {
320 _scp_prefix, // from -Xbootclasspath/p:...
321 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
322 _scp_base, // the default sysclasspath
323 _scp_suffix, // from -Xbootclasspath/a:...
324 _scp_nitems // the number of items, must be last.
325 };
327 const char* _items[_scp_nitems];
328 DEBUG_ONLY(bool _expansion_done;)
329 };
331 SysClassPath::SysClassPath(const char* base) {
332 memset(_items, 0, sizeof(_items));
333 _items[_scp_base] = base;
334 DEBUG_ONLY(_expansion_done = false;)
335 }
337 SysClassPath::~SysClassPath() {
338 // Free everything except the base.
339 for (int i = 0; i < _scp_nitems; ++i) {
340 if (i != _scp_base) reset_item_at(i);
341 }
342 DEBUG_ONLY(_expansion_done = false;)
343 }
345 inline void SysClassPath::set_base(const char* base) {
346 _items[_scp_base] = base;
347 }
349 inline void SysClassPath::add_prefix(const char* prefix) {
350 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
351 }
353 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
354 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
355 }
357 inline void SysClassPath::add_suffix(const char* suffix) {
358 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
359 }
361 inline void SysClassPath::reset_item_at(int index) {
362 assert(index < _scp_nitems && index != _scp_base, "just checking");
363 if (_items[index] != NULL) {
364 FREE_C_HEAP_ARRAY(char, _items[index]);
365 _items[index] = NULL;
366 }
367 }
369 inline void SysClassPath::reset_path(const char* base) {
370 // Clear the prefix and suffix.
371 reset_item_at(_scp_prefix);
372 reset_item_at(_scp_suffix);
373 set_base(base);
374 }
376 //------------------------------------------------------------------------------
378 void SysClassPath::expand_endorsed() {
379 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
381 const char* path = Arguments::get_property("java.endorsed.dirs");
382 if (path == NULL) {
383 path = Arguments::get_endorsed_dir();
384 assert(path != NULL, "no default for java.endorsed.dirs");
385 }
387 char* expanded_path = NULL;
388 const char separator = *os::path_separator();
389 const char* const end = path + strlen(path);
390 while (path < end) {
391 const char* tmp_end = strchr(path, separator);
392 if (tmp_end == NULL) {
393 expanded_path = add_jars_to_path(expanded_path, path);
394 path = end;
395 } else {
396 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
397 memcpy(dirpath, path, tmp_end - path);
398 dirpath[tmp_end - path] = '\0';
399 expanded_path = add_jars_to_path(expanded_path, dirpath);
400 FREE_C_HEAP_ARRAY(char, dirpath);
401 path = tmp_end + 1;
402 }
403 }
404 _items[_scp_endorsed] = expanded_path;
405 DEBUG_ONLY(_expansion_done = true;)
406 }
408 // Combine the bootclasspath elements, some of which may be null, into a single
409 // c-heap-allocated string.
410 char* SysClassPath::combined_path() {
411 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
412 assert(_expansion_done, "must call expand_endorsed() first.");
414 size_t lengths[_scp_nitems];
415 size_t total_len = 0;
417 const char separator = *os::path_separator();
419 // Get the lengths.
420 int i;
421 for (i = 0; i < _scp_nitems; ++i) {
422 if (_items[i] != NULL) {
423 lengths[i] = strlen(_items[i]);
424 // Include space for the separator char (or a NULL for the last item).
425 total_len += lengths[i] + 1;
426 }
427 }
428 assert(total_len > 0, "empty sysclasspath not allowed");
430 // Copy the _items to a single string.
431 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
432 char* cp_tmp = cp;
433 for (i = 0; i < _scp_nitems; ++i) {
434 if (_items[i] != NULL) {
435 memcpy(cp_tmp, _items[i], lengths[i]);
436 cp_tmp += lengths[i];
437 *cp_tmp++ = separator;
438 }
439 }
440 *--cp_tmp = '\0'; // Replace the extra separator.
441 return cp;
442 }
444 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
445 char*
446 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
447 char *cp;
449 assert(str != NULL, "just checking");
450 if (path == NULL) {
451 size_t len = strlen(str) + 1;
452 cp = NEW_C_HEAP_ARRAY(char, len);
453 memcpy(cp, str, len); // copy the trailing null
454 } else {
455 const char separator = *os::path_separator();
456 size_t old_len = strlen(path);
457 size_t str_len = strlen(str);
458 size_t len = old_len + str_len + 2;
460 if (prepend) {
461 cp = NEW_C_HEAP_ARRAY(char, len);
462 char* cp_tmp = cp;
463 memcpy(cp_tmp, str, str_len);
464 cp_tmp += str_len;
465 *cp_tmp = separator;
466 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
467 FREE_C_HEAP_ARRAY(char, path);
468 } else {
469 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
470 char* cp_tmp = cp + old_len;
471 *cp_tmp = separator;
472 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
473 }
474 }
475 return cp;
476 }
478 // Scan the directory and append any jar or zip files found to path.
479 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
480 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
481 DIR* dir = os::opendir(directory);
482 if (dir == NULL) return path;
484 char dir_sep[2] = { '\0', '\0' };
485 size_t directory_len = strlen(directory);
486 const char fileSep = *os::file_separator();
487 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
489 /* Scan the directory for jars/zips, appending them to path. */
490 struct dirent *entry;
491 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
492 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
493 const char* name = entry->d_name;
494 const char* ext = name + strlen(name) - 4;
495 bool isJarOrZip = ext > name &&
496 (os::file_name_strcmp(ext, ".jar") == 0 ||
497 os::file_name_strcmp(ext, ".zip") == 0);
498 if (isJarOrZip) {
499 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
500 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
501 path = add_to_path(path, jarpath, false);
502 FREE_C_HEAP_ARRAY(char, jarpath);
503 }
504 }
505 FREE_C_HEAP_ARRAY(char, dbuf);
506 os::closedir(dir);
507 return path;
508 }
510 // Parses a memory size specification string.
511 static bool atomull(const char *s, julong* result) {
512 julong n = 0;
513 int args_read = sscanf(s, os::julong_format_specifier(), &n);
514 if (args_read != 1) {
515 return false;
516 }
517 while (*s != '\0' && isdigit(*s)) {
518 s++;
519 }
520 // 4705540: illegal if more characters are found after the first non-digit
521 if (strlen(s) > 1) {
522 return false;
523 }
524 switch (*s) {
525 case 'T': case 't':
526 *result = n * G * K;
527 // Check for overflow.
528 if (*result/((julong)G * K) != n) return false;
529 return true;
530 case 'G': case 'g':
531 *result = n * G;
532 if (*result/G != n) return false;
533 return true;
534 case 'M': case 'm':
535 *result = n * M;
536 if (*result/M != n) return false;
537 return true;
538 case 'K': case 'k':
539 *result = n * K;
540 if (*result/K != n) return false;
541 return true;
542 case '\0':
543 *result = n;
544 return true;
545 default:
546 return false;
547 }
548 }
550 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
551 if (size < min_size) return arg_too_small;
552 // Check that size will fit in a size_t (only relevant on 32-bit)
553 if (size > max_uintx) return arg_too_big;
554 return arg_in_range;
555 }
557 // Describe an argument out of range error
558 void Arguments::describe_range_error(ArgsRange errcode) {
559 switch(errcode) {
560 case arg_too_big:
561 jio_fprintf(defaultStream::error_stream(),
562 "The specified size exceeds the maximum "
563 "representable size.\n");
564 break;
565 case arg_too_small:
566 case arg_unreadable:
567 case arg_in_range:
568 // do nothing for now
569 break;
570 default:
571 ShouldNotReachHere();
572 }
573 }
575 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
576 return CommandLineFlags::boolAtPut(name, &value, origin);
577 }
579 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
580 double v;
581 if (sscanf(value, "%lf", &v) != 1) {
582 return false;
583 }
585 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
586 return true;
587 }
588 return false;
589 }
591 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
592 julong v;
593 intx intx_v;
594 bool is_neg = false;
595 // Check the sign first since atomull() parses only unsigned values.
596 if (*value == '-') {
597 if (!CommandLineFlags::intxAt(name, &intx_v)) {
598 return false;
599 }
600 value++;
601 is_neg = true;
602 }
603 if (!atomull(value, &v)) {
604 return false;
605 }
606 intx_v = (intx) v;
607 if (is_neg) {
608 intx_v = -intx_v;
609 }
610 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
611 return true;
612 }
613 uintx uintx_v = (uintx) v;
614 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
615 return true;
616 }
617 uint64_t uint64_t_v = (uint64_t) v;
618 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
619 return true;
620 }
621 return false;
622 }
624 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
625 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
626 // Contract: CommandLineFlags always returns a pointer that needs freeing.
627 FREE_C_HEAP_ARRAY(char, value);
628 return true;
629 }
631 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
632 const char* old_value = "";
633 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
634 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
635 size_t new_len = strlen(new_value);
636 const char* value;
637 char* free_this_too = NULL;
638 if (old_len == 0) {
639 value = new_value;
640 } else if (new_len == 0) {
641 value = old_value;
642 } else {
643 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
644 // each new setting adds another LINE to the switch:
645 sprintf(buf, "%s\n%s", old_value, new_value);
646 value = buf;
647 free_this_too = buf;
648 }
649 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
650 // CommandLineFlags always returns a pointer that needs freeing.
651 FREE_C_HEAP_ARRAY(char, value);
652 if (free_this_too != NULL) {
653 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
654 FREE_C_HEAP_ARRAY(char, free_this_too);
655 }
656 return true;
657 }
659 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
661 // range of acceptable characters spelled out for portability reasons
662 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
663 #define BUFLEN 255
664 char name[BUFLEN+1];
665 char dummy;
667 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
668 return set_bool_flag(name, false, origin);
669 }
670 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
671 return set_bool_flag(name, true, origin);
672 }
674 char punct;
675 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
676 const char* value = strchr(arg, '=') + 1;
677 Flag* flag = Flag::find_flag(name, strlen(name));
678 if (flag != NULL && flag->is_ccstr()) {
679 if (flag->ccstr_accumulates()) {
680 return append_to_string_flag(name, value, origin);
681 } else {
682 if (value[0] == '\0') {
683 value = NULL;
684 }
685 return set_string_flag(name, value, origin);
686 }
687 }
688 }
690 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
691 const char* value = strchr(arg, '=') + 1;
692 // -XX:Foo:=xxx will reset the string flag to the given value.
693 if (value[0] == '\0') {
694 value = NULL;
695 }
696 return set_string_flag(name, value, origin);
697 }
699 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
700 #define SIGNED_NUMBER_RANGE "[-0123456789]"
701 #define NUMBER_RANGE "[0123456789]"
702 char value[BUFLEN + 1];
703 char value2[BUFLEN + 1];
704 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
705 // Looks like a floating-point number -- try again with more lenient format string
706 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
707 return set_fp_numeric_flag(name, value, origin);
708 }
709 }
711 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
713 return set_numeric_flag(name, value, origin);
714 }
716 return false;
717 }
719 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
720 assert(bldarray != NULL, "illegal argument");
722 if (arg == NULL) {
723 return;
724 }
726 int index = *count;
728 // expand the array and add arg to the last element
729 (*count)++;
730 if (*bldarray == NULL) {
731 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
732 } else {
733 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
734 }
735 (*bldarray)[index] = strdup(arg);
736 }
738 void Arguments::build_jvm_args(const char* arg) {
739 add_string(&_jvm_args_array, &_num_jvm_args, arg);
740 }
742 void Arguments::build_jvm_flags(const char* arg) {
743 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
744 }
746 // utility function to return a string that concatenates all
747 // strings in a given char** array
748 const char* Arguments::build_resource_string(char** args, int count) {
749 if (args == NULL || count == 0) {
750 return NULL;
751 }
752 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
753 for (int i = 1; i < count; i++) {
754 length += strlen(args[i]) + 1; // add 1 for a space
755 }
756 char* s = NEW_RESOURCE_ARRAY(char, length);
757 strcpy(s, args[0]);
758 for (int j = 1; j < count; j++) {
759 strcat(s, " ");
760 strcat(s, args[j]);
761 }
762 return (const char*) s;
763 }
765 void Arguments::print_on(outputStream* st) {
766 st->print_cr("VM Arguments:");
767 if (num_jvm_flags() > 0) {
768 st->print("jvm_flags: "); print_jvm_flags_on(st);
769 }
770 if (num_jvm_args() > 0) {
771 st->print("jvm_args: "); print_jvm_args_on(st);
772 }
773 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
774 st->print_cr("Launcher Type: %s", _sun_java_launcher);
775 }
777 void Arguments::print_jvm_flags_on(outputStream* st) {
778 if (_num_jvm_flags > 0) {
779 for (int i=0; i < _num_jvm_flags; i++) {
780 st->print("%s ", _jvm_flags_array[i]);
781 }
782 st->print_cr("");
783 }
784 }
786 void Arguments::print_jvm_args_on(outputStream* st) {
787 if (_num_jvm_args > 0) {
788 for (int i=0; i < _num_jvm_args; i++) {
789 st->print("%s ", _jvm_args_array[i]);
790 }
791 st->print_cr("");
792 }
793 }
795 bool Arguments::process_argument(const char* arg,
796 jboolean ignore_unrecognized, FlagValueOrigin origin) {
798 JDK_Version since = JDK_Version();
800 if (parse_argument(arg, origin)) {
801 // do nothing
802 } else if (is_newly_obsolete(arg, &since)) {
803 enum { bufsize = 256 };
804 char buffer[bufsize];
805 since.to_string(buffer, bufsize);
806 jio_fprintf(defaultStream::error_stream(),
807 "Warning: The flag %s has been EOL'd as of %s and will"
808 " be ignored\n", arg, buffer);
809 } else {
810 if (!ignore_unrecognized) {
811 jio_fprintf(defaultStream::error_stream(),
812 "Unrecognized VM option '%s'\n", arg);
813 // allow for commandline "commenting out" options like -XX:#+Verbose
814 if (strlen(arg) == 0 || arg[0] != '#') {
815 return false;
816 }
817 }
818 }
819 return true;
820 }
822 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
823 FILE* stream = fopen(file_name, "rb");
824 if (stream == NULL) {
825 if (should_exist) {
826 jio_fprintf(defaultStream::error_stream(),
827 "Could not open settings file %s\n", file_name);
828 return false;
829 } else {
830 return true;
831 }
832 }
834 char token[1024];
835 int pos = 0;
837 bool in_white_space = true;
838 bool in_comment = false;
839 bool in_quote = false;
840 char quote_c = 0;
841 bool result = true;
843 int c = getc(stream);
844 while(c != EOF) {
845 if (in_white_space) {
846 if (in_comment) {
847 if (c == '\n') in_comment = false;
848 } else {
849 if (c == '#') in_comment = true;
850 else if (!isspace(c)) {
851 in_white_space = false;
852 token[pos++] = c;
853 }
854 }
855 } else {
856 if (c == '\n' || (!in_quote && isspace(c))) {
857 // token ends at newline, or at unquoted whitespace
858 // this allows a way to include spaces in string-valued options
859 token[pos] = '\0';
860 logOption(token);
861 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
862 build_jvm_flags(token);
863 pos = 0;
864 in_white_space = true;
865 in_quote = false;
866 } else if (!in_quote && (c == '\'' || c == '"')) {
867 in_quote = true;
868 quote_c = c;
869 } else if (in_quote && (c == quote_c)) {
870 in_quote = false;
871 } else {
872 token[pos++] = c;
873 }
874 }
875 c = getc(stream);
876 }
877 if (pos > 0) {
878 token[pos] = '\0';
879 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
880 build_jvm_flags(token);
881 }
882 fclose(stream);
883 return result;
884 }
886 //=============================================================================================================
887 // Parsing of properties (-D)
889 const char* Arguments::get_property(const char* key) {
890 return PropertyList_get_value(system_properties(), key);
891 }
893 bool Arguments::add_property(const char* prop) {
894 const char* eq = strchr(prop, '=');
895 char* key;
896 // ns must be static--its address may be stored in a SystemProperty object.
897 const static char ns[1] = {0};
898 char* value = (char *)ns;
900 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
901 key = AllocateHeap(key_len + 1, "add_property");
902 strncpy(key, prop, key_len);
903 key[key_len] = '\0';
905 if (eq != NULL) {
906 size_t value_len = strlen(prop) - key_len - 1;
907 value = AllocateHeap(value_len + 1, "add_property");
908 strncpy(value, &prop[key_len + 1], value_len + 1);
909 }
911 if (strcmp(key, "java.compiler") == 0) {
912 process_java_compiler_argument(value);
913 FreeHeap(key);
914 if (eq != NULL) {
915 FreeHeap(value);
916 }
917 return true;
918 } else if (strcmp(key, "sun.java.command") == 0) {
919 _java_command = value;
921 // Record value in Arguments, but let it get passed to Java.
922 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
923 // launcher.pid property is private and is processed
924 // in process_sun_java_launcher_properties();
925 // the sun.java.launcher property is passed on to the java application
926 FreeHeap(key);
927 if (eq != NULL) {
928 FreeHeap(value);
929 }
930 return true;
931 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
932 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
933 // its value without going through the property list or making a Java call.
934 _java_vendor_url_bug = value;
935 } else if (strcmp(key, "sun.boot.library.path") == 0) {
936 PropertyList_unique_add(&_system_properties, key, value, true);
937 return true;
938 }
939 // Create new property and add at the end of the list
940 PropertyList_unique_add(&_system_properties, key, value);
941 return true;
942 }
944 //===========================================================================================================
945 // Setting int/mixed/comp mode flags
947 void Arguments::set_mode_flags(Mode mode) {
948 // Set up default values for all flags.
949 // If you add a flag to any of the branches below,
950 // add a default value for it here.
951 set_java_compiler(false);
952 _mode = mode;
954 // Ensure Agent_OnLoad has the correct initial values.
955 // This may not be the final mode; mode may change later in onload phase.
956 PropertyList_unique_add(&_system_properties, "java.vm.info",
957 (char*)Abstract_VM_Version::vm_info_string(), false);
959 UseInterpreter = true;
960 UseCompiler = true;
961 UseLoopCounter = true;
963 // Default values may be platform/compiler dependent -
964 // use the saved values
965 ClipInlining = Arguments::_ClipInlining;
966 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
967 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
968 BackgroundCompilation = Arguments::_BackgroundCompilation;
970 // Change from defaults based on mode
971 switch (mode) {
972 default:
973 ShouldNotReachHere();
974 break;
975 case _int:
976 UseCompiler = false;
977 UseLoopCounter = false;
978 AlwaysCompileLoopMethods = false;
979 UseOnStackReplacement = false;
980 break;
981 case _mixed:
982 // same as default
983 break;
984 case _comp:
985 UseInterpreter = false;
986 BackgroundCompilation = false;
987 ClipInlining = false;
988 break;
989 }
990 }
992 // Conflict: required to use shared spaces (-Xshare:on), but
993 // incompatible command line options were chosen.
995 static void no_shared_spaces() {
996 if (RequireSharedSpaces) {
997 jio_fprintf(defaultStream::error_stream(),
998 "Class data sharing is inconsistent with other specified options.\n");
999 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1000 } else {
1001 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1002 }
1003 }
1005 void Arguments::check_compressed_oops_compat() {
1006 #ifdef _LP64
1007 assert(UseCompressedOops, "Precondition");
1008 // Is it on by default or set on ergonomically
1009 bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops);
1011 // If dumping an archive or forcing its use, disable compressed oops if possible
1012 if (DumpSharedSpaces || RequireSharedSpaces) {
1013 if (is_on_by_default) {
1014 FLAG_SET_DEFAULT(UseCompressedOops, false);
1015 return;
1016 } else {
1017 vm_exit_during_initialization(
1018 "Class Data Sharing is not supported with compressed oops yet", NULL);
1019 }
1020 } else if (UseSharedSpaces) {
1021 // UseSharedSpaces is on by default. With compressed oops, we turn it off.
1022 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1023 }
1024 #endif
1025 }
1027 void Arguments::set_tiered_flags() {
1028 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1029 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
1030 }
1031 if (CompilationPolicyChoice < 2) {
1032 vm_exit_during_initialization(
1033 "Incompatible compilation policy selected", NULL);
1034 }
1035 // Increase the code cache size - tiered compiles a lot more.
1036 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1037 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1038 }
1039 }
1041 #ifndef KERNEL
1042 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1043 // if it's not explictly set or unset. If the user has chosen
1044 // UseParNewGC and not explicitly set ParallelGCThreads we
1045 // set it, unless this is a single cpu machine.
1046 void Arguments::set_parnew_gc_flags() {
1047 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1048 "control point invariant");
1049 assert(UseParNewGC, "Error");
1051 // Turn off AdaptiveSizePolicy by default for parnew until it is
1052 // complete.
1053 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1054 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1055 }
1057 if (ParallelGCThreads == 0) {
1058 FLAG_SET_DEFAULT(ParallelGCThreads,
1059 Abstract_VM_Version::parallel_worker_threads());
1060 if (ParallelGCThreads == 1) {
1061 FLAG_SET_DEFAULT(UseParNewGC, false);
1062 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1063 }
1064 }
1065 if (UseParNewGC) {
1066 // CDS doesn't work with ParNew yet
1067 no_shared_spaces();
1069 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1070 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1071 // we set them to 1024 and 1024.
1072 // See CR 6362902.
1073 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1074 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1075 }
1076 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1077 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1078 }
1080 // AlwaysTenure flag should make ParNew promote all at first collection.
1081 // See CR 6362902.
1082 if (AlwaysTenure) {
1083 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1084 }
1085 // When using compressed oops, we use local overflow stacks,
1086 // rather than using a global overflow list chained through
1087 // the klass word of the object's pre-image.
1088 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1089 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1090 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1091 }
1092 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1093 }
1094 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1095 }
1096 }
1098 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1099 // sparc/solaris for certain applications, but would gain from
1100 // further optimization and tuning efforts, and would almost
1101 // certainly gain from analysis of platform and environment.
1102 void Arguments::set_cms_and_parnew_gc_flags() {
1103 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1104 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1106 // If we are using CMS, we prefer to UseParNewGC,
1107 // unless explicitly forbidden.
1108 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1109 FLAG_SET_ERGO(bool, UseParNewGC, true);
1110 }
1112 // Turn off AdaptiveSizePolicy by default for cms until it is
1113 // complete.
1114 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1115 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1116 }
1118 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1119 // as needed.
1120 if (UseParNewGC) {
1121 set_parnew_gc_flags();
1122 }
1124 // Now make adjustments for CMS
1125 size_t young_gen_per_worker;
1126 intx new_ratio;
1127 size_t min_new_default;
1128 intx tenuring_default;
1129 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1130 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1131 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1132 }
1133 young_gen_per_worker = 4*M;
1134 new_ratio = (intx)15;
1135 min_new_default = 4*M;
1136 tenuring_default = (intx)0;
1137 } else { // new defaults: "new" as of 6.0
1138 young_gen_per_worker = CMSYoungGenPerWorker;
1139 new_ratio = (intx)7;
1140 min_new_default = 16*M;
1141 tenuring_default = (intx)4;
1142 }
1144 // Preferred young gen size for "short" pauses
1145 const uintx parallel_gc_threads =
1146 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1147 const size_t preferred_max_new_size_unaligned =
1148 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1149 const size_t preferred_max_new_size =
1150 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1152 // Unless explicitly requested otherwise, size young gen
1153 // for "short" pauses ~ 4M*ParallelGCThreads
1155 // If either MaxNewSize or NewRatio is set on the command line,
1156 // assume the user is trying to set the size of the young gen.
1158 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1160 // Set MaxNewSize to our calculated preferred_max_new_size unless
1161 // NewSize was set on the command line and it is larger than
1162 // preferred_max_new_size.
1163 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1164 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1165 } else {
1166 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1167 }
1168 if (PrintGCDetails && Verbose) {
1169 // Too early to use gclog_or_tty
1170 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1171 }
1173 // Unless explicitly requested otherwise, prefer a large
1174 // Old to Young gen size so as to shift the collection load
1175 // to the old generation concurrent collector
1177 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1178 // then NewSize and OldSize may be calculated. That would
1179 // generally lead to some differences with ParNewGC for which
1180 // there was no obvious reason. Also limit to the case where
1181 // MaxNewSize has not been set.
1183 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1185 // Code along this path potentially sets NewSize and OldSize
1187 // Calculate the desired minimum size of the young gen but if
1188 // NewSize has been set on the command line, use it here since
1189 // it should be the final value.
1190 size_t min_new;
1191 if (FLAG_IS_DEFAULT(NewSize)) {
1192 min_new = align_size_up(ScaleForWordSize(min_new_default),
1193 os::vm_page_size());
1194 } else {
1195 min_new = NewSize;
1196 }
1197 size_t prev_initial_size = InitialHeapSize;
1198 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1199 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1200 // Currently minimum size and the initial heap sizes are the same.
1201 set_min_heap_size(InitialHeapSize);
1202 if (PrintGCDetails && Verbose) {
1203 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1204 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1205 InitialHeapSize/M, prev_initial_size/M);
1206 }
1207 }
1209 // MaxHeapSize is aligned down in collectorPolicy
1210 size_t max_heap =
1211 align_size_down(MaxHeapSize,
1212 CardTableRS::ct_max_alignment_constraint());
1214 if (PrintGCDetails && Verbose) {
1215 // Too early to use gclog_or_tty
1216 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1217 " initial_heap_size: " SIZE_FORMAT
1218 " max_heap: " SIZE_FORMAT,
1219 min_heap_size(), InitialHeapSize, max_heap);
1220 }
1221 if (max_heap > min_new) {
1222 // Unless explicitly requested otherwise, make young gen
1223 // at least min_new, and at most preferred_max_new_size.
1224 if (FLAG_IS_DEFAULT(NewSize)) {
1225 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1226 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1227 if (PrintGCDetails && Verbose) {
1228 // Too early to use gclog_or_tty
1229 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1230 }
1231 }
1232 // Unless explicitly requested otherwise, size old gen
1233 // so that it's at least 3X of NewSize to begin with;
1234 // later NewRatio will decide how it grows; see above.
1235 if (FLAG_IS_DEFAULT(OldSize)) {
1236 if (max_heap > NewSize) {
1237 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1238 if (PrintGCDetails && Verbose) {
1239 // Too early to use gclog_or_tty
1240 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1241 }
1242 }
1243 }
1244 }
1245 }
1246 // Unless explicitly requested otherwise, definitely
1247 // promote all objects surviving "tenuring_default" scavenges.
1248 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1249 FLAG_IS_DEFAULT(SurvivorRatio)) {
1250 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1251 }
1252 // If we decided above (or user explicitly requested)
1253 // `promote all' (via MaxTenuringThreshold := 0),
1254 // prefer minuscule survivor spaces so as not to waste
1255 // space for (non-existent) survivors
1256 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1257 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1258 }
1259 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1260 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1261 // This is done in order to make ParNew+CMS configuration to work
1262 // with YoungPLABSize and OldPLABSize options.
1263 // See CR 6362902.
1264 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1265 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1266 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1267 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1268 // the value (either from the command line or ergonomics) of
1269 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1270 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1271 } else {
1272 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1273 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1274 // we'll let it to take precedence.
1275 jio_fprintf(defaultStream::error_stream(),
1276 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1277 " options are specified for the CMS collector."
1278 " CMSParPromoteBlocksToClaim will take precedence.\n");
1279 }
1280 }
1281 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1282 // OldPLAB sizing manually turned off: Use a larger default setting,
1283 // unless it was manually specified. This is because a too-low value
1284 // will slow down scavenges.
1285 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1286 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1287 }
1288 }
1289 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1290 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1291 // If either of the static initialization defaults have changed, note this
1292 // modification.
1293 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1294 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1295 }
1296 if (PrintGCDetails && Verbose) {
1297 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1298 MarkStackSize / K, MarkStackSizeMax / K);
1299 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1300 }
1301 }
1302 #endif // KERNEL
1304 void set_object_alignment() {
1305 // Object alignment.
1306 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1307 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1308 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1309 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1310 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1311 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1313 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1314 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1316 // Oop encoding heap max
1317 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1319 #ifndef KERNEL
1320 // Set CMS global values
1321 CompactibleFreeListSpace::set_cms_values();
1322 #endif // KERNEL
1323 }
1325 bool verify_object_alignment() {
1326 // Object alignment.
1327 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1328 jio_fprintf(defaultStream::error_stream(),
1329 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1330 (int)ObjectAlignmentInBytes);
1331 return false;
1332 }
1333 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1334 jio_fprintf(defaultStream::error_stream(),
1335 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1336 (int)ObjectAlignmentInBytes, BytesPerLong);
1337 return false;
1338 }
1339 // It does not make sense to have big object alignment
1340 // since a space lost due to alignment will be greater
1341 // then a saved space from compressed oops.
1342 if ((int)ObjectAlignmentInBytes > 256) {
1343 jio_fprintf(defaultStream::error_stream(),
1344 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1345 (int)ObjectAlignmentInBytes);
1346 return false;
1347 }
1348 // In case page size is very small.
1349 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1350 jio_fprintf(defaultStream::error_stream(),
1351 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1352 (int)ObjectAlignmentInBytes, os::vm_page_size());
1353 return false;
1354 }
1355 return true;
1356 }
1358 inline uintx max_heap_for_compressed_oops() {
1359 // Avoid sign flip.
1360 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1361 return 0;
1362 }
1363 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1364 NOT_LP64(ShouldNotReachHere(); return 0);
1365 }
1367 bool Arguments::should_auto_select_low_pause_collector() {
1368 if (UseAutoGCSelectPolicy &&
1369 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1370 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1371 if (PrintGCDetails) {
1372 // Cannot use gclog_or_tty yet.
1373 tty->print_cr("Automatic selection of the low pause collector"
1374 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1375 }
1376 return true;
1377 }
1378 return false;
1379 }
1381 void Arguments::set_ergonomics_flags() {
1382 // Parallel GC is not compatible with sharing. If one specifies
1383 // that they want sharing explicitly, do not set ergonomics flags.
1384 if (DumpSharedSpaces || ForceSharedSpaces) {
1385 return;
1386 }
1388 if (os::is_server_class_machine() && !force_client_mode ) {
1389 // If no other collector is requested explicitly,
1390 // let the VM select the collector based on
1391 // machine class and automatic selection policy.
1392 if (!UseSerialGC &&
1393 !UseConcMarkSweepGC &&
1394 !UseG1GC &&
1395 !UseParNewGC &&
1396 !DumpSharedSpaces &&
1397 FLAG_IS_DEFAULT(UseParallelGC)) {
1398 if (should_auto_select_low_pause_collector()) {
1399 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1400 } else {
1401 FLAG_SET_ERGO(bool, UseParallelGC, true);
1402 }
1403 no_shared_spaces();
1404 }
1405 }
1407 #ifndef ZERO
1408 #ifdef _LP64
1409 // Check that UseCompressedOops can be set with the max heap size allocated
1410 // by ergonomics.
1411 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1412 #if !defined(COMPILER1) || defined(TIERED)
1413 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1414 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1415 }
1416 #endif
1417 #ifdef _WIN64
1418 if (UseLargePages && UseCompressedOops) {
1419 // Cannot allocate guard pages for implicit checks in indexed addressing
1420 // mode, when large pages are specified on windows.
1421 // This flag could be switched ON if narrow oop base address is set to 0,
1422 // see code in Universe::initialize_heap().
1423 Universe::set_narrow_oop_use_implicit_null_checks(false);
1424 }
1425 #endif // _WIN64
1426 } else {
1427 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1428 warning("Max heap size too large for Compressed Oops");
1429 FLAG_SET_DEFAULT(UseCompressedOops, false);
1430 }
1431 }
1432 // Also checks that certain machines are slower with compressed oops
1433 // in vm_version initialization code.
1434 #endif // _LP64
1435 #endif // !ZERO
1436 }
1438 void Arguments::set_parallel_gc_flags() {
1439 assert(UseParallelGC || UseParallelOldGC, "Error");
1440 // If parallel old was requested, automatically enable parallel scavenge.
1441 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1442 FLAG_SET_DEFAULT(UseParallelGC, true);
1443 }
1445 // If no heap maximum was requested explicitly, use some reasonable fraction
1446 // of the physical memory, up to a maximum of 1GB.
1447 if (UseParallelGC) {
1448 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1449 Abstract_VM_Version::parallel_worker_threads());
1451 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1452 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1453 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1454 // See CR 6362902 for details.
1455 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1456 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1457 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1458 }
1459 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1460 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1461 }
1462 }
1464 if (UseParallelOldGC) {
1465 // Par compact uses lower default values since they are treated as
1466 // minimums. These are different defaults because of the different
1467 // interpretation and are not ergonomically set.
1468 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1469 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1470 }
1471 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1472 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1473 }
1474 }
1475 }
1476 }
1478 void Arguments::set_g1_gc_flags() {
1479 assert(UseG1GC, "Error");
1480 #ifdef COMPILER1
1481 FastTLABRefill = false;
1482 #endif
1483 FLAG_SET_DEFAULT(ParallelGCThreads,
1484 Abstract_VM_Version::parallel_worker_threads());
1485 if (ParallelGCThreads == 0) {
1486 FLAG_SET_DEFAULT(ParallelGCThreads,
1487 Abstract_VM_Version::parallel_worker_threads());
1488 }
1489 no_shared_spaces();
1491 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1492 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1493 }
1494 if (PrintGCDetails && Verbose) {
1495 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1496 MarkStackSize / K, MarkStackSizeMax / K);
1497 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1498 }
1500 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1501 // In G1, we want the default GC overhead goal to be higher than
1502 // say in PS. So we set it here to 10%. Otherwise the heap might
1503 // be expanded more aggressively than we would like it to. In
1504 // fact, even 10% seems to not be high enough in some cases
1505 // (especially small GC stress tests that the main thing they do
1506 // is allocation). We might consider increase it further.
1507 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1508 }
1509 }
1511 void Arguments::set_heap_size() {
1512 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1513 // Deprecated flag
1514 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1515 }
1517 const julong phys_mem =
1518 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1519 : (julong)MaxRAM;
1521 // If the maximum heap size has not been set with -Xmx,
1522 // 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(MaxHeapSize)) {
1525 julong reasonable_max = phys_mem / MaxRAMFraction;
1527 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1528 // Small physical memory, so use a minimum fraction of it for the heap
1529 reasonable_max = phys_mem / MinRAMFraction;
1530 } else {
1531 // Not-small physical memory, so require a heap at least
1532 // as large as MaxHeapSize
1533 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1534 }
1535 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1536 // Limit the heap size to ErgoHeapSizeLimit
1537 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1538 }
1539 if (UseCompressedOops) {
1540 // Limit the heap size to the maximum possible when using compressed oops
1541 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1542 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1543 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1544 // but it should be not less than default MaxHeapSize.
1545 max_coop_heap -= HeapBaseMinAddress;
1546 }
1547 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1548 }
1549 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1551 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1552 // An initial heap size was specified on the command line,
1553 // so be sure that the maximum size is consistent. Done
1554 // after call to allocatable_physical_memory because that
1555 // method might reduce the allocation size.
1556 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1557 }
1559 if (PrintGCDetails && Verbose) {
1560 // Cannot use gclog_or_tty yet.
1561 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1562 }
1563 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1564 }
1566 // If the initial_heap_size has not been set with InitialHeapSize
1567 // or -Xms, then set it as fraction of the size of physical memory,
1568 // respecting the maximum and minimum sizes of the heap.
1569 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1570 julong reasonable_minimum = (julong)(OldSize + NewSize);
1572 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1574 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1576 julong reasonable_initial = phys_mem / InitialRAMFraction;
1578 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1579 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1581 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1583 if (PrintGCDetails && Verbose) {
1584 // Cannot use gclog_or_tty yet.
1585 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1586 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1587 }
1588 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1589 set_min_heap_size((uintx)reasonable_minimum);
1590 }
1591 }
1593 // This must be called after ergonomics because we want bytecode rewriting
1594 // if the server compiler is used, or if UseSharedSpaces is disabled.
1595 void Arguments::set_bytecode_flags() {
1596 // Better not attempt to store into a read-only space.
1597 if (UseSharedSpaces) {
1598 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1599 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1600 }
1602 if (!RewriteBytecodes) {
1603 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1604 }
1605 }
1607 // Aggressive optimization flags -XX:+AggressiveOpts
1608 void Arguments::set_aggressive_opts_flags() {
1609 #ifdef COMPILER2
1610 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1611 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1612 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1613 }
1614 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1615 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1616 }
1618 // Feed the cache size setting into the JDK
1619 char buffer[1024];
1620 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1621 add_property(buffer);
1622 }
1623 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1624 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1625 }
1626 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1627 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1628 }
1629 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1630 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1631 }
1632 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1633 FLAG_SET_DEFAULT(OptimizeFill, true);
1634 }
1635 #endif
1637 if (AggressiveOpts) {
1638 // Sample flag setting code
1639 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1640 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1641 // }
1642 }
1643 }
1645 //===========================================================================================================
1646 // Parsing of java.compiler property
1648 void Arguments::process_java_compiler_argument(char* arg) {
1649 // For backwards compatibility, Djava.compiler=NONE or ""
1650 // causes us to switch to -Xint mode UNLESS -Xdebug
1651 // is also specified.
1652 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1653 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1654 }
1655 }
1657 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1658 _sun_java_launcher = strdup(launcher);
1659 }
1661 bool Arguments::created_by_java_launcher() {
1662 assert(_sun_java_launcher != NULL, "property must have value");
1663 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1664 }
1666 //===========================================================================================================
1667 // Parsing of main arguments
1669 bool Arguments::verify_interval(uintx val, uintx min,
1670 uintx max, const char* name) {
1671 // Returns true iff value is in the inclusive interval [min..max]
1672 // false, otherwise.
1673 if (val >= min && val <= max) {
1674 return true;
1675 }
1676 jio_fprintf(defaultStream::error_stream(),
1677 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1678 " and " UINTX_FORMAT "\n",
1679 name, val, min, max);
1680 return false;
1681 }
1683 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1684 // Returns true if given value is greater than specified min threshold
1685 // false, otherwise.
1686 if (val >= min ) {
1687 return true;
1688 }
1689 jio_fprintf(defaultStream::error_stream(),
1690 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1691 name, val, min);
1692 return false;
1693 }
1695 bool Arguments::verify_percentage(uintx value, const char* name) {
1696 if (value <= 100) {
1697 return true;
1698 }
1699 jio_fprintf(defaultStream::error_stream(),
1700 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1701 name, value);
1702 return false;
1703 }
1705 static void force_serial_gc() {
1706 FLAG_SET_DEFAULT(UseSerialGC, true);
1707 FLAG_SET_DEFAULT(UseParNewGC, false);
1708 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1709 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1710 FLAG_SET_DEFAULT(UseParallelGC, false);
1711 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1712 FLAG_SET_DEFAULT(UseG1GC, false);
1713 }
1715 static bool verify_serial_gc_flags() {
1716 return (UseSerialGC &&
1717 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1718 UseParallelGC || UseParallelOldGC));
1719 }
1721 // Check consistency of GC selection
1722 bool Arguments::check_gc_consistency() {
1723 bool status = true;
1724 // Ensure that the user has not selected conflicting sets
1725 // of collectors. [Note: this check is merely a user convenience;
1726 // collectors over-ride each other so that only a non-conflicting
1727 // set is selected; however what the user gets is not what they
1728 // may have expected from the combination they asked for. It's
1729 // better to reduce user confusion by not allowing them to
1730 // select conflicting combinations.
1731 uint i = 0;
1732 if (UseSerialGC) i++;
1733 if (UseConcMarkSweepGC || UseParNewGC) i++;
1734 if (UseParallelGC || UseParallelOldGC) i++;
1735 if (UseG1GC) i++;
1736 if (i > 1) {
1737 jio_fprintf(defaultStream::error_stream(),
1738 "Conflicting collector combinations in option list; "
1739 "please refer to the release notes for the combinations "
1740 "allowed\n");
1741 status = false;
1742 }
1744 return status;
1745 }
1747 // Check stack pages settings
1748 bool Arguments::check_stack_pages()
1749 {
1750 bool status = true;
1751 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1752 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1753 // greater stack shadow pages can't generate instruction to bang stack
1754 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1755 return status;
1756 }
1758 // Check the consistency of vm_init_args
1759 bool Arguments::check_vm_args_consistency() {
1760 // Method for adding checks for flag consistency.
1761 // The intent is to warn the user of all possible conflicts,
1762 // before returning an error.
1763 // Note: Needs platform-dependent factoring.
1764 bool status = true;
1766 #if ( (defined(COMPILER2) && defined(SPARC)))
1767 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1768 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1769 // x86. Normally, VM_Version_init must be called from init_globals in
1770 // init.cpp, which is called by the initial java thread *after* arguments
1771 // have been parsed. VM_Version_init gets called twice on sparc.
1772 extern void VM_Version_init();
1773 VM_Version_init();
1774 if (!VM_Version::has_v9()) {
1775 jio_fprintf(defaultStream::error_stream(),
1776 "V8 Machine detected, Server requires V9\n");
1777 status = false;
1778 }
1779 #endif /* COMPILER2 && SPARC */
1781 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1782 // builds so the cost of stack banging can be measured.
1783 #if (defined(PRODUCT) && defined(SOLARIS))
1784 if (!UseBoundThreads && !UseStackBanging) {
1785 jio_fprintf(defaultStream::error_stream(),
1786 "-UseStackBanging conflicts with -UseBoundThreads\n");
1788 status = false;
1789 }
1790 #endif
1792 if (TLABRefillWasteFraction == 0) {
1793 jio_fprintf(defaultStream::error_stream(),
1794 "TLABRefillWasteFraction should be a denominator, "
1795 "not " SIZE_FORMAT "\n",
1796 TLABRefillWasteFraction);
1797 status = false;
1798 }
1800 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1801 "AdaptiveSizePolicyWeight");
1802 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1803 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1804 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1805 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1807 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1808 jio_fprintf(defaultStream::error_stream(),
1809 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1810 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1811 MinHeapFreeRatio, MaxHeapFreeRatio);
1812 status = false;
1813 }
1814 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1815 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1817 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1818 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1819 }
1821 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1822 // Settings to encourage splitting.
1823 if (!FLAG_IS_CMDLINE(NewRatio)) {
1824 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1825 }
1826 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1827 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1828 }
1829 }
1831 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1832 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1833 if (GCTimeLimit == 100) {
1834 // Turn off gc-overhead-limit-exceeded checks
1835 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1836 }
1838 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1840 // Check whether user-specified sharing option conflicts with GC or page size.
1841 // Both sharing and large pages are enabled by default on some platforms;
1842 // large pages override sharing only if explicitly set on the command line.
1843 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1844 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1845 UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1846 if (cannot_share) {
1847 // Either force sharing on by forcing the other options off, or
1848 // force sharing off.
1849 if (DumpSharedSpaces || ForceSharedSpaces) {
1850 jio_fprintf(defaultStream::error_stream(),
1851 "Using Serial GC and default page size because of %s\n",
1852 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1853 force_serial_gc();
1854 FLAG_SET_DEFAULT(UseLargePages, false);
1855 } else {
1856 if (UseSharedSpaces && Verbose) {
1857 jio_fprintf(defaultStream::error_stream(),
1858 "Turning off use of shared archive because of "
1859 "choice of garbage collector or large pages\n");
1860 }
1861 no_shared_spaces();
1862 }
1863 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1864 FLAG_SET_DEFAULT(UseLargePages, false);
1865 }
1867 status = status && check_gc_consistency();
1868 status = status && check_stack_pages();
1870 if (_has_alloc_profile) {
1871 if (UseParallelGC || UseParallelOldGC) {
1872 jio_fprintf(defaultStream::error_stream(),
1873 "error: invalid argument combination.\n"
1874 "Allocation profiling (-Xaprof) cannot be used together with "
1875 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1876 status = false;
1877 }
1878 if (UseConcMarkSweepGC) {
1879 jio_fprintf(defaultStream::error_stream(),
1880 "error: invalid argument combination.\n"
1881 "Allocation profiling (-Xaprof) cannot be used together with "
1882 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1883 status = false;
1884 }
1885 }
1887 if (CMSIncrementalMode) {
1888 if (!UseConcMarkSweepGC) {
1889 jio_fprintf(defaultStream::error_stream(),
1890 "error: invalid argument combination.\n"
1891 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1892 "selected in order\nto use CMSIncrementalMode.\n");
1893 status = false;
1894 } else {
1895 status = status && verify_percentage(CMSIncrementalDutyCycle,
1896 "CMSIncrementalDutyCycle");
1897 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1898 "CMSIncrementalDutyCycleMin");
1899 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1900 "CMSIncrementalSafetyFactor");
1901 status = status && verify_percentage(CMSIncrementalOffset,
1902 "CMSIncrementalOffset");
1903 status = status && verify_percentage(CMSExpAvgFactor,
1904 "CMSExpAvgFactor");
1905 // If it was not set on the command line, set
1906 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1907 if (CMSInitiatingOccupancyFraction < 0) {
1908 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1909 }
1910 }
1911 }
1913 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1914 // insists that we hold the requisite locks so that the iteration is
1915 // MT-safe. For the verification at start-up and shut-down, we don't
1916 // yet have a good way of acquiring and releasing these locks,
1917 // which are not visible at the CollectedHeap level. We want to
1918 // be able to acquire these locks and then do the iteration rather
1919 // than just disable the lock verification. This will be fixed under
1920 // bug 4788986.
1921 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1922 if (VerifyGCStartAt == 0) {
1923 warning("Heap verification at start-up disabled "
1924 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1925 VerifyGCStartAt = 1; // Disable verification at start-up
1926 }
1927 if (VerifyBeforeExit) {
1928 warning("Heap verification at shutdown disabled "
1929 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1930 VerifyBeforeExit = false; // Disable verification at shutdown
1931 }
1932 }
1934 // Note: only executed in non-PRODUCT mode
1935 if (!UseAsyncConcMarkSweepGC &&
1936 (ExplicitGCInvokesConcurrent ||
1937 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1938 jio_fprintf(defaultStream::error_stream(),
1939 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1940 " with -UseAsyncConcMarkSweepGC");
1941 status = false;
1942 }
1944 if (UseG1GC) {
1945 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1946 "InitiatingHeapOccupancyPercent");
1947 }
1949 status = status && verify_interval(RefDiscoveryPolicy,
1950 ReferenceProcessor::DiscoveryPolicyMin,
1951 ReferenceProcessor::DiscoveryPolicyMax,
1952 "RefDiscoveryPolicy");
1954 // Limit the lower bound of this flag to 1 as it is used in a division
1955 // expression.
1956 status = status && verify_interval(TLABWasteTargetPercent,
1957 1, 100, "TLABWasteTargetPercent");
1959 status = status && verify_object_alignment();
1961 return status;
1962 }
1964 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1965 const char* option_type) {
1966 if (ignore) return false;
1968 const char* spacer = " ";
1969 if (option_type == NULL) {
1970 option_type = ++spacer; // Set both to the empty string.
1971 }
1973 if (os::obsolete_option(option)) {
1974 jio_fprintf(defaultStream::error_stream(),
1975 "Obsolete %s%soption: %s\n", option_type, spacer,
1976 option->optionString);
1977 return false;
1978 } else {
1979 jio_fprintf(defaultStream::error_stream(),
1980 "Unrecognized %s%soption: %s\n", option_type, spacer,
1981 option->optionString);
1982 return true;
1983 }
1984 }
1986 static const char* user_assertion_options[] = {
1987 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1988 };
1990 static const char* system_assertion_options[] = {
1991 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1992 };
1994 // Return true if any of the strings in null-terminated array 'names' matches.
1995 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1996 // the option must match exactly.
1997 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1998 bool tail_allowed) {
1999 for (/* empty */; *names != NULL; ++names) {
2000 if (match_option(option, *names, tail)) {
2001 if (**tail == '\0' || tail_allowed && **tail == ':') {
2002 return true;
2003 }
2004 }
2005 }
2006 return false;
2007 }
2009 bool Arguments::parse_uintx(const char* value,
2010 uintx* uintx_arg,
2011 uintx min_size) {
2013 // Check the sign first since atomull() parses only unsigned values.
2014 bool value_is_positive = !(*value == '-');
2016 if (value_is_positive) {
2017 julong n;
2018 bool good_return = atomull(value, &n);
2019 if (good_return) {
2020 bool above_minimum = n >= min_size;
2021 bool value_is_too_large = n > max_uintx;
2023 if (above_minimum && !value_is_too_large) {
2024 *uintx_arg = n;
2025 return true;
2026 }
2027 }
2028 }
2029 return false;
2030 }
2032 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2033 julong* long_arg,
2034 julong min_size) {
2035 if (!atomull(s, long_arg)) return arg_unreadable;
2036 return check_memory_size(*long_arg, min_size);
2037 }
2039 // Parse JavaVMInitArgs structure
2041 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2042 // For components of the system classpath.
2043 SysClassPath scp(Arguments::get_sysclasspath());
2044 bool scp_assembly_required = false;
2046 // Save default settings for some mode flags
2047 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2048 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2049 Arguments::_ClipInlining = ClipInlining;
2050 Arguments::_BackgroundCompilation = BackgroundCompilation;
2052 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2053 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2054 if (result != JNI_OK) {
2055 return result;
2056 }
2058 // Parse JavaVMInitArgs structure passed in
2059 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2060 if (result != JNI_OK) {
2061 return result;
2062 }
2064 if (AggressiveOpts) {
2065 // Insert alt-rt.jar between user-specified bootclasspath
2066 // prefix and the default bootclasspath. os::set_boot_path()
2067 // uses meta_index_dir as the default bootclasspath directory.
2068 const char* altclasses_jar = "alt-rt.jar";
2069 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2070 strlen(altclasses_jar);
2071 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2072 strcpy(altclasses_path, get_meta_index_dir());
2073 strcat(altclasses_path, altclasses_jar);
2074 scp.add_suffix_to_prefix(altclasses_path);
2075 scp_assembly_required = true;
2076 FREE_C_HEAP_ARRAY(char, altclasses_path);
2077 }
2079 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2080 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2081 if (result != JNI_OK) {
2082 return result;
2083 }
2085 // Do final processing now that all arguments have been parsed
2086 result = finalize_vm_init_args(&scp, scp_assembly_required);
2087 if (result != JNI_OK) {
2088 return result;
2089 }
2091 return JNI_OK;
2092 }
2094 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2095 SysClassPath* scp_p,
2096 bool* scp_assembly_required_p,
2097 FlagValueOrigin origin) {
2098 // Remaining part of option string
2099 const char* tail;
2101 // iterate over arguments
2102 for (int index = 0; index < args->nOptions; index++) {
2103 bool is_absolute_path = false; // for -agentpath vs -agentlib
2105 const JavaVMOption* option = args->options + index;
2107 if (!match_option(option, "-Djava.class.path", &tail) &&
2108 !match_option(option, "-Dsun.java.command", &tail) &&
2109 !match_option(option, "-Dsun.java.launcher", &tail)) {
2111 // add all jvm options to the jvm_args string. This string
2112 // is used later to set the java.vm.args PerfData string constant.
2113 // the -Djava.class.path and the -Dsun.java.command options are
2114 // omitted from jvm_args string as each have their own PerfData
2115 // string constant object.
2116 build_jvm_args(option->optionString);
2117 }
2119 // -verbose:[class/gc/jni]
2120 if (match_option(option, "-verbose", &tail)) {
2121 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2122 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2123 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2124 } else if (!strcmp(tail, ":gc")) {
2125 FLAG_SET_CMDLINE(bool, PrintGC, true);
2126 } else if (!strcmp(tail, ":jni")) {
2127 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2128 }
2129 // -da / -ea / -disableassertions / -enableassertions
2130 // These accept an optional class/package name separated by a colon, e.g.,
2131 // -da:java.lang.Thread.
2132 } else if (match_option(option, user_assertion_options, &tail, true)) {
2133 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2134 if (*tail == '\0') {
2135 JavaAssertions::setUserClassDefault(enable);
2136 } else {
2137 assert(*tail == ':', "bogus match by match_option()");
2138 JavaAssertions::addOption(tail + 1, enable);
2139 }
2140 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2141 } else if (match_option(option, system_assertion_options, &tail, false)) {
2142 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2143 JavaAssertions::setSystemClassDefault(enable);
2144 // -bootclasspath:
2145 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2146 scp_p->reset_path(tail);
2147 *scp_assembly_required_p = true;
2148 // -bootclasspath/a:
2149 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2150 scp_p->add_suffix(tail);
2151 *scp_assembly_required_p = true;
2152 // -bootclasspath/p:
2153 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2154 scp_p->add_prefix(tail);
2155 *scp_assembly_required_p = true;
2156 // -Xrun
2157 } else if (match_option(option, "-Xrun", &tail)) {
2158 if (tail != NULL) {
2159 const char* pos = strchr(tail, ':');
2160 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2161 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2162 name[len] = '\0';
2164 char *options = NULL;
2165 if(pos != NULL) {
2166 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2167 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2168 }
2169 #ifdef JVMTI_KERNEL
2170 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2171 warning("profiling and debugging agents are not supported with Kernel VM");
2172 } else
2173 #endif // JVMTI_KERNEL
2174 add_init_library(name, options);
2175 }
2176 // -agentlib and -agentpath
2177 } else if (match_option(option, "-agentlib:", &tail) ||
2178 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2179 if(tail != NULL) {
2180 const char* pos = strchr(tail, '=');
2181 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2182 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2183 name[len] = '\0';
2185 char *options = NULL;
2186 if(pos != NULL) {
2187 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2188 }
2189 #ifdef JVMTI_KERNEL
2190 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2191 warning("profiling and debugging agents are not supported with Kernel VM");
2192 } else
2193 #endif // JVMTI_KERNEL
2194 add_init_agent(name, options, is_absolute_path);
2196 }
2197 // -javaagent
2198 } else if (match_option(option, "-javaagent:", &tail)) {
2199 if(tail != NULL) {
2200 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2201 add_init_agent("instrument", options, false);
2202 }
2203 // -Xnoclassgc
2204 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2205 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2206 // -Xincgc: i-CMS
2207 } else if (match_option(option, "-Xincgc", &tail)) {
2208 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2209 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2210 // -Xnoincgc: no i-CMS
2211 } else if (match_option(option, "-Xnoincgc", &tail)) {
2212 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2213 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2214 // -Xconcgc
2215 } else if (match_option(option, "-Xconcgc", &tail)) {
2216 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2217 // -Xnoconcgc
2218 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2219 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2220 // -Xbatch
2221 } else if (match_option(option, "-Xbatch", &tail)) {
2222 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2223 // -Xmn for compatibility with other JVM vendors
2224 } else if (match_option(option, "-Xmn", &tail)) {
2225 julong long_initial_eden_size = 0;
2226 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2227 if (errcode != arg_in_range) {
2228 jio_fprintf(defaultStream::error_stream(),
2229 "Invalid initial eden size: %s\n", option->optionString);
2230 describe_range_error(errcode);
2231 return JNI_EINVAL;
2232 }
2233 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2234 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2235 // -Xms
2236 } else if (match_option(option, "-Xms", &tail)) {
2237 julong long_initial_heap_size = 0;
2238 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2239 if (errcode != arg_in_range) {
2240 jio_fprintf(defaultStream::error_stream(),
2241 "Invalid initial heap size: %s\n", option->optionString);
2242 describe_range_error(errcode);
2243 return JNI_EINVAL;
2244 }
2245 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2246 // Currently the minimum size and the initial heap sizes are the same.
2247 set_min_heap_size(InitialHeapSize);
2248 // -Xmx
2249 } else if (match_option(option, "-Xmx", &tail)) {
2250 julong long_max_heap_size = 0;
2251 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2252 if (errcode != arg_in_range) {
2253 jio_fprintf(defaultStream::error_stream(),
2254 "Invalid maximum heap size: %s\n", option->optionString);
2255 describe_range_error(errcode);
2256 return JNI_EINVAL;
2257 }
2258 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2259 // Xmaxf
2260 } else if (match_option(option, "-Xmaxf", &tail)) {
2261 int maxf = (int)(atof(tail) * 100);
2262 if (maxf < 0 || maxf > 100) {
2263 jio_fprintf(defaultStream::error_stream(),
2264 "Bad max heap free percentage size: %s\n",
2265 option->optionString);
2266 return JNI_EINVAL;
2267 } else {
2268 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2269 }
2270 // Xminf
2271 } else if (match_option(option, "-Xminf", &tail)) {
2272 int minf = (int)(atof(tail) * 100);
2273 if (minf < 0 || minf > 100) {
2274 jio_fprintf(defaultStream::error_stream(),
2275 "Bad min heap free percentage size: %s\n",
2276 option->optionString);
2277 return JNI_EINVAL;
2278 } else {
2279 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2280 }
2281 // -Xss
2282 } else if (match_option(option, "-Xss", &tail)) {
2283 julong long_ThreadStackSize = 0;
2284 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2285 if (errcode != arg_in_range) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "Invalid thread stack size: %s\n", option->optionString);
2288 describe_range_error(errcode);
2289 return JNI_EINVAL;
2290 }
2291 // Internally track ThreadStackSize in units of 1024 bytes.
2292 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2293 round_to((int)long_ThreadStackSize, K) / K);
2294 // -Xoss
2295 } else if (match_option(option, "-Xoss", &tail)) {
2296 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2297 // -Xmaxjitcodesize
2298 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2299 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2300 julong long_ReservedCodeCacheSize = 0;
2301 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2302 (size_t)InitialCodeCacheSize);
2303 if (errcode != arg_in_range) {
2304 jio_fprintf(defaultStream::error_stream(),
2305 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2306 option->optionString, InitialCodeCacheSize/K);
2307 describe_range_error(errcode);
2308 return JNI_EINVAL;
2309 }
2310 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2311 // -green
2312 } else if (match_option(option, "-green", &tail)) {
2313 jio_fprintf(defaultStream::error_stream(),
2314 "Green threads support not available\n");
2315 return JNI_EINVAL;
2316 // -native
2317 } else if (match_option(option, "-native", &tail)) {
2318 // HotSpot always uses native threads, ignore silently for compatibility
2319 // -Xsqnopause
2320 } else if (match_option(option, "-Xsqnopause", &tail)) {
2321 // EVM option, ignore silently for compatibility
2322 // -Xrs
2323 } else if (match_option(option, "-Xrs", &tail)) {
2324 // Classic/EVM option, new functionality
2325 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2326 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2327 // change default internal VM signals used - lower case for back compat
2328 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2329 // -Xoptimize
2330 } else if (match_option(option, "-Xoptimize", &tail)) {
2331 // EVM option, ignore silently for compatibility
2332 // -Xprof
2333 } else if (match_option(option, "-Xprof", &tail)) {
2334 #ifndef FPROF_KERNEL
2335 _has_profile = true;
2336 #else // FPROF_KERNEL
2337 // do we have to exit?
2338 warning("Kernel VM does not support flat profiling.");
2339 #endif // FPROF_KERNEL
2340 // -Xaprof
2341 } else if (match_option(option, "-Xaprof", &tail)) {
2342 _has_alloc_profile = true;
2343 // -Xconcurrentio
2344 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2345 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2346 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2347 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2348 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2349 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2351 // -Xinternalversion
2352 } else if (match_option(option, "-Xinternalversion", &tail)) {
2353 jio_fprintf(defaultStream::output_stream(), "%s\n",
2354 VM_Version::internal_vm_info_string());
2355 vm_exit(0);
2356 #ifndef PRODUCT
2357 // -Xprintflags
2358 } else if (match_option(option, "-Xprintflags", &tail)) {
2359 CommandLineFlags::printFlags();
2360 vm_exit(0);
2361 #endif
2362 // -D
2363 } else if (match_option(option, "-D", &tail)) {
2364 if (!add_property(tail)) {
2365 return JNI_ENOMEM;
2366 }
2367 // Out of the box management support
2368 if (match_option(option, "-Dcom.sun.management", &tail)) {
2369 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2370 }
2371 // -Xint
2372 } else if (match_option(option, "-Xint", &tail)) {
2373 set_mode_flags(_int);
2374 // -Xmixed
2375 } else if (match_option(option, "-Xmixed", &tail)) {
2376 set_mode_flags(_mixed);
2377 // -Xcomp
2378 } else if (match_option(option, "-Xcomp", &tail)) {
2379 // for testing the compiler; turn off all flags that inhibit compilation
2380 set_mode_flags(_comp);
2382 // -Xshare:dump
2383 } else if (match_option(option, "-Xshare:dump", &tail)) {
2384 #ifdef TIERED
2385 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2386 set_mode_flags(_int); // Prevent compilation, which creates objects
2387 #elif defined(COMPILER2)
2388 vm_exit_during_initialization(
2389 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2390 #elif defined(KERNEL)
2391 vm_exit_during_initialization(
2392 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2393 #else
2394 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2395 set_mode_flags(_int); // Prevent compilation, which creates objects
2396 #endif
2397 // -Xshare:on
2398 } else if (match_option(option, "-Xshare:on", &tail)) {
2399 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2400 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2401 #ifdef TIERED
2402 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2403 #endif // TIERED
2404 // -Xshare:auto
2405 } else if (match_option(option, "-Xshare:auto", &tail)) {
2406 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2407 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2408 // -Xshare:off
2409 } else if (match_option(option, "-Xshare:off", &tail)) {
2410 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2411 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2413 // -Xverify
2414 } else if (match_option(option, "-Xverify", &tail)) {
2415 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2416 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2417 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2418 } else if (strcmp(tail, ":remote") == 0) {
2419 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2420 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2421 } else if (strcmp(tail, ":none") == 0) {
2422 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2423 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2424 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2425 return JNI_EINVAL;
2426 }
2427 // -Xdebug
2428 } else if (match_option(option, "-Xdebug", &tail)) {
2429 // note this flag has been used, then ignore
2430 set_xdebug_mode(true);
2431 // -Xnoagent
2432 } else if (match_option(option, "-Xnoagent", &tail)) {
2433 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2434 } else if (match_option(option, "-Xboundthreads", &tail)) {
2435 // Bind user level threads to kernel threads (Solaris only)
2436 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2437 } else if (match_option(option, "-Xloggc:", &tail)) {
2438 // Redirect GC output to the file. -Xloggc:<filename>
2439 // ostream_init_log(), when called will use this filename
2440 // to initialize a fileStream.
2441 _gc_log_filename = strdup(tail);
2442 FLAG_SET_CMDLINE(bool, PrintGC, true);
2443 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2444 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2446 // JNI hooks
2447 } else if (match_option(option, "-Xcheck", &tail)) {
2448 if (!strcmp(tail, ":jni")) {
2449 CheckJNICalls = true;
2450 } else if (is_bad_option(option, args->ignoreUnrecognized,
2451 "check")) {
2452 return JNI_EINVAL;
2453 }
2454 } else if (match_option(option, "vfprintf", &tail)) {
2455 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2456 } else if (match_option(option, "exit", &tail)) {
2457 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2458 } else if (match_option(option, "abort", &tail)) {
2459 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2460 // -XX:+AggressiveHeap
2461 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2463 // This option inspects the machine and attempts to set various
2464 // parameters to be optimal for long-running, memory allocation
2465 // intensive jobs. It is intended for machines with large
2466 // amounts of cpu and memory.
2468 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2469 // VM, but we may not be able to represent the total physical memory
2470 // available (like having 8gb of memory on a box but using a 32bit VM).
2471 // Thus, we need to make sure we're using a julong for intermediate
2472 // calculations.
2473 julong initHeapSize;
2474 julong total_memory = os::physical_memory();
2476 if (total_memory < (julong)256*M) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2479 vm_exit(1);
2480 }
2482 // The heap size is half of available memory, or (at most)
2483 // all of possible memory less 160mb (leaving room for the OS
2484 // when using ISM). This is the maximum; because adaptive sizing
2485 // is turned on below, the actual space used may be smaller.
2487 initHeapSize = MIN2(total_memory / (julong)2,
2488 total_memory - (julong)160*M);
2490 // Make sure that if we have a lot of memory we cap the 32 bit
2491 // process space. The 64bit VM version of this function is a nop.
2492 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2494 // The perm gen is separate but contiguous with the
2495 // object heap (and is reserved with it) so subtract it
2496 // from the heap size.
2497 if (initHeapSize > MaxPermSize) {
2498 initHeapSize = initHeapSize - MaxPermSize;
2499 } else {
2500 warning("AggressiveHeap and MaxPermSize values may conflict");
2501 }
2503 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2504 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2505 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2506 // Currently the minimum size and the initial heap sizes are the same.
2507 set_min_heap_size(initHeapSize);
2508 }
2509 if (FLAG_IS_DEFAULT(NewSize)) {
2510 // Make the young generation 3/8ths of the total heap.
2511 FLAG_SET_CMDLINE(uintx, NewSize,
2512 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2513 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2514 }
2516 FLAG_SET_DEFAULT(UseLargePages, true);
2518 // Increase some data structure sizes for efficiency
2519 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2520 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2521 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2523 // See the OldPLABSize comment below, but replace 'after promotion'
2524 // with 'after copying'. YoungPLABSize is the size of the survivor
2525 // space per-gc-thread buffers. The default is 4kw.
2526 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2528 // OldPLABSize is the size of the buffers in the old gen that
2529 // UseParallelGC uses to promote live data that doesn't fit in the
2530 // survivor spaces. At any given time, there's one for each gc thread.
2531 // The default size is 1kw. These buffers are rarely used, since the
2532 // survivor spaces are usually big enough. For specjbb, however, there
2533 // are occasions when there's lots of live data in the young gen
2534 // and we end up promoting some of it. We don't have a definite
2535 // explanation for why bumping OldPLABSize helps, but the theory
2536 // is that a bigger PLAB results in retaining something like the
2537 // original allocation order after promotion, which improves mutator
2538 // locality. A minor effect may be that larger PLABs reduce the
2539 // number of PLAB allocation events during gc. The value of 8kw
2540 // was arrived at by experimenting with specjbb.
2541 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2543 // CompilationPolicyChoice=0 causes the server compiler to adopt
2544 // a more conservative which-method-do-I-compile policy when one
2545 // of the counters maintained by the interpreter trips. The
2546 // result is reduced startup time and improved specjbb and
2547 // alacrity performance. Zero is the default, but we set it
2548 // explicitly here in case the default changes.
2549 // See runtime/compilationPolicy.*.
2550 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2552 // Enable parallel GC and adaptive generation sizing
2553 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2554 FLAG_SET_DEFAULT(ParallelGCThreads,
2555 Abstract_VM_Version::parallel_worker_threads());
2557 // Encourage steady state memory management
2558 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2560 // This appears to improve mutator locality
2561 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2563 // Get around early Solaris scheduling bug
2564 // (affinity vs other jobs on system)
2565 // but disallow DR and offlining (5008695).
2566 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2568 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2569 // The last option must always win.
2570 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2571 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2572 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2573 // The last option must always win.
2574 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2575 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2576 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2577 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2578 jio_fprintf(defaultStream::error_stream(),
2579 "Please use CMSClassUnloadingEnabled in place of "
2580 "CMSPermGenSweepingEnabled in the future\n");
2581 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2582 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2583 jio_fprintf(defaultStream::error_stream(),
2584 "Please use -XX:+UseGCOverheadLimit in place of "
2585 "-XX:+UseGCTimeLimit in the future\n");
2586 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2587 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2588 jio_fprintf(defaultStream::error_stream(),
2589 "Please use -XX:-UseGCOverheadLimit in place of "
2590 "-XX:-UseGCTimeLimit in the future\n");
2591 // The TLE options are for compatibility with 1.3 and will be
2592 // removed without notice in a future release. These options
2593 // are not to be documented.
2594 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2595 // No longer used.
2596 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2597 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2598 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2599 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2600 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2601 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2602 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2603 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2604 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2605 // No longer used.
2606 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2607 julong long_tlab_size = 0;
2608 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2609 if (errcode != arg_in_range) {
2610 jio_fprintf(defaultStream::error_stream(),
2611 "Invalid TLAB size: %s\n", option->optionString);
2612 describe_range_error(errcode);
2613 return JNI_EINVAL;
2614 }
2615 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2616 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2617 // No longer used.
2618 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2619 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2620 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2621 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2622 SOLARIS_ONLY(
2623 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2624 warning("-XX:+UsePermISM is obsolete.");
2625 FLAG_SET_CMDLINE(bool, UseISM, true);
2626 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2627 FLAG_SET_CMDLINE(bool, UseISM, false);
2628 )
2629 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2630 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2631 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2632 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2633 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2634 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2635 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2636 #ifdef SOLARIS
2637 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2638 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2639 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2640 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2641 #else // ndef SOLARIS
2642 jio_fprintf(defaultStream::error_stream(),
2643 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2644 return JNI_EINVAL;
2645 #endif // ndef SOLARIS
2646 #ifdef ASSERT
2647 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2648 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2649 // disable scavenge before parallel mark-compact
2650 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2651 #endif
2652 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2653 julong cms_blocks_to_claim = (julong)atol(tail);
2654 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2655 jio_fprintf(defaultStream::error_stream(),
2656 "Please use -XX:OldPLABSize in place of "
2657 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2658 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2659 julong cms_blocks_to_claim = (julong)atol(tail);
2660 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Please use -XX:OldPLABSize in place of "
2663 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2664 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2665 julong old_plab_size = 0;
2666 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2667 if (errcode != arg_in_range) {
2668 jio_fprintf(defaultStream::error_stream(),
2669 "Invalid old PLAB size: %s\n", option->optionString);
2670 describe_range_error(errcode);
2671 return JNI_EINVAL;
2672 }
2673 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2674 jio_fprintf(defaultStream::error_stream(),
2675 "Please use -XX:OldPLABSize in place of "
2676 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2677 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2678 julong young_plab_size = 0;
2679 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2680 if (errcode != arg_in_range) {
2681 jio_fprintf(defaultStream::error_stream(),
2682 "Invalid young PLAB size: %s\n", option->optionString);
2683 describe_range_error(errcode);
2684 return JNI_EINVAL;
2685 }
2686 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2687 jio_fprintf(defaultStream::error_stream(),
2688 "Please use -XX:YoungPLABSize in place of "
2689 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2690 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2691 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2692 julong stack_size = 0;
2693 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2694 if (errcode != arg_in_range) {
2695 jio_fprintf(defaultStream::error_stream(),
2696 "Invalid mark stack size: %s\n", option->optionString);
2697 describe_range_error(errcode);
2698 return JNI_EINVAL;
2699 }
2700 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2701 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2702 julong max_stack_size = 0;
2703 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2704 if (errcode != arg_in_range) {
2705 jio_fprintf(defaultStream::error_stream(),
2706 "Invalid maximum mark stack size: %s\n",
2707 option->optionString);
2708 describe_range_error(errcode);
2709 return JNI_EINVAL;
2710 }
2711 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2712 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2713 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2714 uintx conc_threads = 0;
2715 if (!parse_uintx(tail, &conc_threads, 1)) {
2716 jio_fprintf(defaultStream::error_stream(),
2717 "Invalid concurrent threads: %s\n", option->optionString);
2718 return JNI_EINVAL;
2719 }
2720 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2721 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2722 // Skip -XX:Flags= since that case has already been handled
2723 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2724 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2725 return JNI_EINVAL;
2726 }
2727 }
2728 // Unknown option
2729 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2730 return JNI_ERR;
2731 }
2732 }
2733 // Change the default value for flags which have different default values
2734 // when working with older JDKs.
2735 if (JDK_Version::current().compare_major(6) <= 0 &&
2736 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2737 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2738 }
2739 #ifdef LINUX
2740 if (JDK_Version::current().compare_major(6) <= 0 &&
2741 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2742 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2743 }
2744 #endif // LINUX
2745 return JNI_OK;
2746 }
2748 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2749 // This must be done after all -D arguments have been processed.
2750 scp_p->expand_endorsed();
2752 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2753 // Assemble the bootclasspath elements into the final path.
2754 Arguments::set_sysclasspath(scp_p->combined_path());
2755 }
2757 // This must be done after all arguments have been processed.
2758 // java_compiler() true means set to "NONE" or empty.
2759 if (java_compiler() && !xdebug_mode()) {
2760 // For backwards compatibility, we switch to interpreted mode if
2761 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2762 // not specified.
2763 set_mode_flags(_int);
2764 }
2765 if (CompileThreshold == 0) {
2766 set_mode_flags(_int);
2767 }
2769 #ifndef COMPILER2
2770 // Don't degrade server performance for footprint
2771 if (FLAG_IS_DEFAULT(UseLargePages) &&
2772 MaxHeapSize < LargePageHeapSizeThreshold) {
2773 // No need for large granularity pages w/small heaps.
2774 // Note that large pages are enabled/disabled for both the
2775 // Java heap and the code cache.
2776 FLAG_SET_DEFAULT(UseLargePages, false);
2777 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2778 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2779 }
2781 // Tiered compilation is undefined with C1.
2782 TieredCompilation = false;
2783 #else
2784 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2785 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2786 }
2787 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2788 if (UseG1GC) {
2789 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2790 }
2791 #endif
2793 // If we are running in a headless jre, force java.awt.headless property
2794 // to be true unless the property has already been set.
2795 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2796 if (os::is_headless_jre()) {
2797 const char* headless = Arguments::get_property("java.awt.headless");
2798 if (headless == NULL) {
2799 char envbuffer[128];
2800 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2801 if (!add_property("java.awt.headless=true")) {
2802 return JNI_ENOMEM;
2803 }
2804 } else {
2805 char buffer[256];
2806 strcpy(buffer, "java.awt.headless=");
2807 strcat(buffer, envbuffer);
2808 if (!add_property(buffer)) {
2809 return JNI_ENOMEM;
2810 }
2811 }
2812 }
2813 }
2815 if (!check_vm_args_consistency()) {
2816 return JNI_ERR;
2817 }
2819 return JNI_OK;
2820 }
2822 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2823 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2824 scp_assembly_required_p);
2825 }
2827 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2828 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2829 scp_assembly_required_p);
2830 }
2832 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2833 const int N_MAX_OPTIONS = 64;
2834 const int OPTION_BUFFER_SIZE = 1024;
2835 char buffer[OPTION_BUFFER_SIZE];
2837 // The variable will be ignored if it exceeds the length of the buffer.
2838 // Don't check this variable if user has special privileges
2839 // (e.g. unix su command).
2840 if (os::getenv(name, buffer, sizeof(buffer)) &&
2841 !os::have_special_privileges()) {
2842 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2843 jio_fprintf(defaultStream::error_stream(),
2844 "Picked up %s: %s\n", name, buffer);
2845 char* rd = buffer; // pointer to the input string (rd)
2846 int i;
2847 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2848 while (isspace(*rd)) rd++; // skip whitespace
2849 if (*rd == 0) break; // we re done when the input string is read completely
2851 // The output, option string, overwrites the input string.
2852 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2853 // input string (rd).
2854 char* wrt = rd;
2856 options[i++].optionString = wrt; // Fill in option
2857 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2858 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2859 int quote = *rd; // matching quote to look for
2860 rd++; // don't copy open quote
2861 while (*rd != quote) { // include everything (even spaces) up until quote
2862 if (*rd == 0) { // string termination means unmatched string
2863 jio_fprintf(defaultStream::error_stream(),
2864 "Unmatched quote in %s\n", name);
2865 return JNI_ERR;
2866 }
2867 *wrt++ = *rd++; // copy to option string
2868 }
2869 rd++; // don't copy close quote
2870 } else {
2871 *wrt++ = *rd++; // copy to option string
2872 }
2873 }
2874 // Need to check if we're done before writing a NULL,
2875 // because the write could be to the byte that rd is pointing to.
2876 if (*rd++ == 0) {
2877 *wrt = 0;
2878 break;
2879 }
2880 *wrt = 0; // Zero terminate option
2881 }
2882 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2883 JavaVMInitArgs vm_args;
2884 vm_args.version = JNI_VERSION_1_2;
2885 vm_args.options = options;
2886 vm_args.nOptions = i;
2887 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2889 if (PrintVMOptions) {
2890 const char* tail;
2891 for (int i = 0; i < vm_args.nOptions; i++) {
2892 const JavaVMOption *option = vm_args.options + i;
2893 if (match_option(option, "-XX:", &tail)) {
2894 logOption(tail);
2895 }
2896 }
2897 }
2899 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2900 }
2901 return JNI_OK;
2902 }
2905 // Parse entry point called from JNI_CreateJavaVM
2907 jint Arguments::parse(const JavaVMInitArgs* args) {
2909 // Sharing support
2910 // Construct the path to the archive
2911 char jvm_path[JVM_MAXPATHLEN];
2912 os::jvm_path(jvm_path, sizeof(jvm_path));
2913 #ifdef TIERED
2914 if (strstr(jvm_path, "client") != NULL) {
2915 force_client_mode = true;
2916 }
2917 #endif // TIERED
2918 char *end = strrchr(jvm_path, *os::file_separator());
2919 if (end != NULL) *end = '\0';
2920 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2921 strlen(os::file_separator()) + 20);
2922 if (shared_archive_path == NULL) return JNI_ENOMEM;
2923 strcpy(shared_archive_path, jvm_path);
2924 strcat(shared_archive_path, os::file_separator());
2925 strcat(shared_archive_path, "classes");
2926 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2927 strcat(shared_archive_path, ".jsa");
2928 SharedArchivePath = shared_archive_path;
2930 // Remaining part of option string
2931 const char* tail;
2933 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2934 bool settings_file_specified = false;
2935 const char* flags_file;
2936 int index;
2937 for (index = 0; index < args->nOptions; index++) {
2938 const JavaVMOption *option = args->options + index;
2939 if (match_option(option, "-XX:Flags=", &tail)) {
2940 flags_file = tail;
2941 settings_file_specified = true;
2942 }
2943 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2944 PrintVMOptions = true;
2945 }
2946 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2947 PrintVMOptions = false;
2948 }
2949 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2950 IgnoreUnrecognizedVMOptions = true;
2951 }
2952 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2953 IgnoreUnrecognizedVMOptions = false;
2954 }
2955 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2956 CommandLineFlags::printFlags();
2957 vm_exit(0);
2958 }
2960 #ifndef PRODUCT
2961 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2962 CommandLineFlags::printFlags(true);
2963 vm_exit(0);
2964 }
2965 #endif
2966 }
2968 if (IgnoreUnrecognizedVMOptions) {
2969 // uncast const to modify the flag args->ignoreUnrecognized
2970 *(jboolean*)(&args->ignoreUnrecognized) = true;
2971 }
2973 // Parse specified settings file
2974 if (settings_file_specified) {
2975 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2976 return JNI_EINVAL;
2977 }
2978 }
2980 // Parse default .hotspotrc settings file
2981 if (!settings_file_specified) {
2982 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2983 return JNI_EINVAL;
2984 }
2985 }
2987 if (PrintVMOptions) {
2988 for (index = 0; index < args->nOptions; index++) {
2989 const JavaVMOption *option = args->options + index;
2990 if (match_option(option, "-XX:", &tail)) {
2991 logOption(tail);
2992 }
2993 }
2994 }
2996 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2997 jint result = parse_vm_init_args(args);
2998 if (result != JNI_OK) {
2999 return result;
3000 }
3002 #ifndef PRODUCT
3003 if (TraceBytecodesAt != 0) {
3004 TraceBytecodes = true;
3005 }
3006 if (CountCompiledCalls) {
3007 if (UseCounterDecay) {
3008 warning("UseCounterDecay disabled because CountCalls is set");
3009 UseCounterDecay = false;
3010 }
3011 }
3012 #endif // PRODUCT
3014 if (EnableInvokeDynamic && !EnableMethodHandles) {
3015 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
3016 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
3017 }
3018 EnableMethodHandles = true;
3019 }
3020 if (EnableMethodHandles && !AnonymousClasses) {
3021 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
3022 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
3023 }
3024 AnonymousClasses = true;
3025 }
3026 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
3027 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3028 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
3029 }
3030 ScavengeRootsInCode = 1;
3031 }
3033 if (PrintGCDetails) {
3034 // Turn on -verbose:gc options as well
3035 PrintGC = true;
3036 }
3038 // Set object alignment values.
3039 set_object_alignment();
3041 #ifdef SERIALGC
3042 force_serial_gc();
3043 #endif // SERIALGC
3044 #ifdef KERNEL
3045 no_shared_spaces();
3046 #endif // KERNEL
3048 // Set flags based on ergonomics.
3049 set_ergonomics_flags();
3051 if (UseCompressedOops) {
3052 check_compressed_oops_compat();
3053 }
3055 // Check the GC selections again.
3056 if (!check_gc_consistency()) {
3057 return JNI_EINVAL;
3058 }
3060 if (TieredCompilation) {
3061 set_tiered_flags();
3062 } else {
3063 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3064 if (CompilationPolicyChoice >= 2) {
3065 vm_exit_during_initialization(
3066 "Incompatible compilation policy selected", NULL);
3067 }
3068 }
3070 #ifndef KERNEL
3071 if (UseConcMarkSweepGC) {
3072 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
3073 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
3074 // are true, we don't call set_parnew_gc_flags() as well.
3075 set_cms_and_parnew_gc_flags();
3076 } else {
3077 // Set heap size based on available physical memory
3078 set_heap_size();
3079 // Set per-collector flags
3080 if (UseParallelGC || UseParallelOldGC) {
3081 set_parallel_gc_flags();
3082 } else if (UseParNewGC) {
3083 set_parnew_gc_flags();
3084 } else if (UseG1GC) {
3085 set_g1_gc_flags();
3086 }
3087 }
3088 #endif // KERNEL
3090 #ifdef SERIALGC
3091 assert(verify_serial_gc_flags(), "SerialGC unset");
3092 #endif // SERIALGC
3094 // Set bytecode rewriting flags
3095 set_bytecode_flags();
3097 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3098 set_aggressive_opts_flags();
3100 #ifdef CC_INTERP
3101 // Clear flags not supported by the C++ interpreter
3102 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3103 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3104 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3105 #endif // CC_INTERP
3107 #ifdef COMPILER2
3108 if (!UseBiasedLocking || EmitSync != 0) {
3109 UseOptoBiasInlining = false;
3110 }
3111 #endif
3113 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3114 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3115 DebugNonSafepoints = true;
3116 }
3118 #ifndef PRODUCT
3119 if (CompileTheWorld) {
3120 // Force NmethodSweeper to sweep whole CodeCache each time.
3121 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3122 NmethodSweepFraction = 1;
3123 }
3124 }
3125 #endif
3127 if (PrintCommandLineFlags) {
3128 CommandLineFlags::printSetFlags();
3129 }
3131 // Apply CPU specific policy for the BiasedLocking
3132 if (UseBiasedLocking) {
3133 if (!VM_Version::use_biased_locking() &&
3134 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3135 UseBiasedLocking = false;
3136 }
3137 }
3139 return JNI_OK;
3140 }
3142 int Arguments::PropertyList_count(SystemProperty* pl) {
3143 int count = 0;
3144 while(pl != NULL) {
3145 count++;
3146 pl = pl->next();
3147 }
3148 return count;
3149 }
3151 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3152 assert(key != NULL, "just checking");
3153 SystemProperty* prop;
3154 for (prop = pl; prop != NULL; prop = prop->next()) {
3155 if (strcmp(key, prop->key()) == 0) return prop->value();
3156 }
3157 return NULL;
3158 }
3160 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3161 int count = 0;
3162 const char* ret_val = NULL;
3164 while(pl != NULL) {
3165 if(count >= index) {
3166 ret_val = pl->key();
3167 break;
3168 }
3169 count++;
3170 pl = pl->next();
3171 }
3173 return ret_val;
3174 }
3176 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3177 int count = 0;
3178 char* ret_val = NULL;
3180 while(pl != NULL) {
3181 if(count >= index) {
3182 ret_val = pl->value();
3183 break;
3184 }
3185 count++;
3186 pl = pl->next();
3187 }
3189 return ret_val;
3190 }
3192 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3193 SystemProperty* p = *plist;
3194 if (p == NULL) {
3195 *plist = new_p;
3196 } else {
3197 while (p->next() != NULL) {
3198 p = p->next();
3199 }
3200 p->set_next(new_p);
3201 }
3202 }
3204 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3205 if (plist == NULL)
3206 return;
3208 SystemProperty* new_p = new SystemProperty(k, v, true);
3209 PropertyList_add(plist, new_p);
3210 }
3212 // This add maintains unique property key in the list.
3213 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3214 if (plist == NULL)
3215 return;
3217 // If property key exist then update with new value.
3218 SystemProperty* prop;
3219 for (prop = *plist; prop != NULL; prop = prop->next()) {
3220 if (strcmp(k, prop->key()) == 0) {
3221 if (append) {
3222 prop->append_value(v);
3223 } else {
3224 prop->set_value(v);
3225 }
3226 return;
3227 }
3228 }
3230 PropertyList_add(plist, k, v);
3231 }
3233 #ifdef KERNEL
3234 char *Arguments::get_kernel_properties() {
3235 // Find properties starting with kernel and append them to string
3236 // We need to find out how long they are first because the URL's that they
3237 // might point to could get long.
3238 int length = 0;
3239 SystemProperty* prop;
3240 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3241 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3242 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3243 }
3244 }
3245 // Add one for null terminator.
3246 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3247 if (length != 0) {
3248 int pos = 0;
3249 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3250 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3251 jio_snprintf(&props[pos], length-pos,
3252 "-D%s=%s ", prop->key(), prop->value());
3253 pos = strlen(props);
3254 }
3255 }
3256 }
3257 // null terminate props in case of null
3258 props[length] = '\0';
3259 return props;
3260 }
3261 #endif // KERNEL
3263 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3264 // Returns true if all of the source pointed by src has been copied over to
3265 // the destination buffer pointed by buf. Otherwise, returns false.
3266 // Notes:
3267 // 1. If the length (buflen) of the destination buffer excluding the
3268 // NULL terminator character is not long enough for holding the expanded
3269 // pid characters, it also returns false instead of returning the partially
3270 // expanded one.
3271 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3272 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3273 char* buf, size_t buflen) {
3274 const char* p = src;
3275 char* b = buf;
3276 const char* src_end = &src[srclen];
3277 char* buf_end = &buf[buflen - 1];
3279 while (p < src_end && b < buf_end) {
3280 if (*p == '%') {
3281 switch (*(++p)) {
3282 case '%': // "%%" ==> "%"
3283 *b++ = *p++;
3284 break;
3285 case 'p': { // "%p" ==> current process id
3286 // buf_end points to the character before the last character so
3287 // that we could write '\0' to the end of the buffer.
3288 size_t buf_sz = buf_end - b + 1;
3289 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3291 // if jio_snprintf fails or the buffer is not long enough to hold
3292 // the expanded pid, returns false.
3293 if (ret < 0 || ret >= (int)buf_sz) {
3294 return false;
3295 } else {
3296 b += ret;
3297 assert(*b == '\0', "fail in copy_expand_pid");
3298 if (p == src_end && b == buf_end + 1) {
3299 // reach the end of the buffer.
3300 return true;
3301 }
3302 }
3303 p++;
3304 break;
3305 }
3306 default :
3307 *b++ = '%';
3308 }
3309 } else {
3310 *b++ = *p++;
3311 }
3312 }
3313 *b = '\0';
3314 return (p == src_end); // return false if not all of the source was copied
3315 }