1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "compiler/compilerOracle.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/cardTableRS.hpp"
30 #include "memory/referenceProcessor.hpp"
31 #include "memory/universe.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/jvmtiExport.hpp"
34 #include "runtime/arguments.hpp"
35 #include "runtime/globals_extension.hpp"
36 #include "runtime/java.hpp"
37 #include "services/management.hpp"
38 #include "utilities/defaultStream.hpp"
39 #include "utilities/taskqueue.hpp"
40 #ifdef TARGET_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
61
62 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
63 #define DEFAULT_JAVA_LAUNCHER "generic"
64
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;
81
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;
87
88 char* Arguments::SharedArchivePath = NULL;
89
90 AgentLibraryList Arguments::_libraryList;
91 AgentLibraryList Arguments::_agentList;
92
93 abort_hook_t Arguments::_abort_hook = NULL;
94 exit_hook_t Arguments::_exit_hook = NULL;
95 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
96
97
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;
105
106 char* Arguments::_meta_index_path = NULL;
107 char* Arguments::_meta_index_dir = NULL;
108
109 static bool force_client_mode = false;
110
111 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
112
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 }
123
124 static void logOption(const char* opt) {
125 if (PrintVMOptions) {
126 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
127 }
128 }
129
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;
138
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 }
149
150 // Initialize system properties key and value.
151 void Arguments::init_system_properties() {
152
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));
158
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);
168
169 _java_class_path = new SystemProperty("java.class.path", "", true);
170
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);
179
180 // Set OS specific system properties values
181 os::init_system_properties_values();
182 }
183
184
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;
191
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);
197
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 }
205
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;
219
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 };
246
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 }
270
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();
288
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);
294
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();
300
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]; }
305
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();
309
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);
314
315 inline void reset_item_at(int index);
316
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 };
326
327 const char* _items[_scp_nitems];
328 DEBUG_ONLY(bool _expansion_done;)
329 };
330
331 SysClassPath::SysClassPath(const char* base) {
332 memset(_items, 0, sizeof(_items));
333 _items[_scp_base] = base;
334 DEBUG_ONLY(_expansion_done = false;)
335 }
336
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 }
344
345 inline void SysClassPath::set_base(const char* base) {
346 _items[_scp_base] = base;
347 }
348
349 inline void SysClassPath::add_prefix(const char* prefix) {
350 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
351 }
352
353 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
354 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
355 }
356
357 inline void SysClassPath::add_suffix(const char* suffix) {
358 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
359 }
360
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 }
368
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 }
375
376 //------------------------------------------------------------------------------
377
378 void SysClassPath::expand_endorsed() {
379 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
380
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 }
386
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 }
407
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.");
413
414 size_t lengths[_scp_nitems];
415 size_t total_len = 0;
416
417 const char separator = *os::path_separator();
418
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");
429
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 }
443
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;
448
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;
459
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 }
477
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;
483
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;
488
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 }
509
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 }
549
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 }
556
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 }
574
575 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
576 return CommandLineFlags::boolAtPut(name, &value, origin);
577 }
578
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 }
584
585 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
586 return true;
587 }
588 return false;
589 }
590
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 }
623
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 }
630
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 }
658
659 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
660
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;
666
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 }
673
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 }
689
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 }
698
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 }
710
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 }
715
716 return false;
717 }
718
719 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
720 assert(bldarray != NULL, "illegal argument");
721
722 if (arg == NULL) {
723 return;
724 }
725
726 int index = *count;
727
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 }
737
738 void Arguments::build_jvm_args(const char* arg) {
739 add_string(&_jvm_args_array, &_num_jvm_args, arg);
740 }
741
742 void Arguments::build_jvm_flags(const char* arg) {
743 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
744 }
745
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 }
764
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 }
776
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 }
785
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 }
794
795 bool Arguments::process_argument(const char* arg,
796 jboolean ignore_unrecognized, FlagValueOrigin origin) {
797
798 JDK_Version since = JDK_Version();
799
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 }
821
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 }
833
834 char token[1024];
835 int pos = 0;
836
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;
842
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 }
885
886 //=============================================================================================================
887 // Parsing of properties (-D)
888
889 const char* Arguments::get_property(const char* key) {
890 return PropertyList_get_value(system_properties(), key);
891 }
892
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;
899
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';
904
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 }
910
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;
920
921 // don't add this property to the properties exposed to the java application
922 FreeHeap(key);
923 return true;
924 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
925 // launcher.pid property is private and is processed
926 // in process_sun_java_launcher_properties();
927 // the sun.java.launcher property is passed on to the java application
928 FreeHeap(key);
929 if (eq != NULL) {
930 FreeHeap(value);
931 }
932 return true;
933 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
934 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
935 // its value without going through the property list or making a Java call.
936 _java_vendor_url_bug = value;
937 } else if (strcmp(key, "sun.boot.library.path") == 0) {
938 PropertyList_unique_add(&_system_properties, key, value, true);
939 return true;
940 }
941 // Create new property and add at the end of the list
942 PropertyList_unique_add(&_system_properties, key, value);
943 return true;
944 }
945
946 //===========================================================================================================
947 // Setting int/mixed/comp mode flags
948
949 void Arguments::set_mode_flags(Mode mode) {
950 // Set up default values for all flags.
951 // If you add a flag to any of the branches below,
952 // add a default value for it here.
953 set_java_compiler(false);
954 _mode = mode;
955
956 // Ensure Agent_OnLoad has the correct initial values.
957 // This may not be the final mode; mode may change later in onload phase.
958 PropertyList_unique_add(&_system_properties, "java.vm.info",
959 (char*)Abstract_VM_Version::vm_info_string(), false);
960
961 UseInterpreter = true;
962 UseCompiler = true;
963 UseLoopCounter = true;
964
965 // Default values may be platform/compiler dependent -
966 // use the saved values
967 ClipInlining = Arguments::_ClipInlining;
968 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
969 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
970 BackgroundCompilation = Arguments::_BackgroundCompilation;
971
972 // Change from defaults based on mode
973 switch (mode) {
974 default:
975 ShouldNotReachHere();
976 break;
977 case _int:
978 UseCompiler = false;
979 UseLoopCounter = false;
980 AlwaysCompileLoopMethods = false;
981 UseOnStackReplacement = false;
982 break;
983 case _mixed:
984 // same as default
985 break;
986 case _comp:
987 UseInterpreter = false;
988 BackgroundCompilation = false;
989 ClipInlining = false;
990 break;
991 }
992 }
993
994 // Conflict: required to use shared spaces (-Xshare:on), but
995 // incompatible command line options were chosen.
996
997 static void no_shared_spaces() {
998 if (RequireSharedSpaces) {
999 jio_fprintf(defaultStream::error_stream(),
1000 "Class data sharing is inconsistent with other specified options.\n");
1001 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1002 } else {
1003 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1004 }
1005 }
1006
1007 void Arguments::check_compressed_oops_compat() {
1008 #ifdef _LP64
1009 assert(UseCompressedOops, "Precondition");
1010 // Is it on by default or set on ergonomically
1011 bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops);
1012
1013 // If dumping an archive or forcing its use, disable compressed oops if possible
1014 if (DumpSharedSpaces || RequireSharedSpaces) {
1015 if (is_on_by_default) {
1016 FLAG_SET_DEFAULT(UseCompressedOops, false);
1017 return;
1018 } else {
1019 vm_exit_during_initialization(
1020 "Class Data Sharing is not supported with compressed oops yet", NULL);
1021 }
1022 } else if (UseSharedSpaces) {
1023 // UseSharedSpaces is on by default. With compressed oops, we turn it off.
1024 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1025 }
1026 #endif
1027 }
1028
1029 void Arguments::set_tiered_flags() {
1030 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1031 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
1032 }
1033 if (CompilationPolicyChoice < 2) {
1034 vm_exit_during_initialization(
1035 "Incompatible compilation policy selected", NULL);
1036 }
1037 // Increase the code cache size - tiered compiles a lot more.
1038 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1039 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1040 }
1041 }
1042
1043 #ifndef KERNEL
1044 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1045 // if it's not explictly set or unset. If the user has chosen
1046 // UseParNewGC and not explicitly set ParallelGCThreads we
1047 // set it, unless this is a single cpu machine.
1048 void Arguments::set_parnew_gc_flags() {
1049 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1050 "control point invariant");
1051 assert(UseParNewGC, "Error");
1052
1053 // Turn off AdaptiveSizePolicy by default for parnew until it is
1054 // complete.
1055 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1056 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1057 }
1058
1059 if (ParallelGCThreads == 0) {
1060 FLAG_SET_DEFAULT(ParallelGCThreads,
1061 Abstract_VM_Version::parallel_worker_threads());
1062 if (ParallelGCThreads == 1) {
1063 FLAG_SET_DEFAULT(UseParNewGC, false);
1064 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1065 }
1066 }
1067 if (UseParNewGC) {
1068 // CDS doesn't work with ParNew yet
1069 no_shared_spaces();
1070
1071 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1072 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1073 // we set them to 1024 and 1024.
1074 // See CR 6362902.
1075 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1076 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1077 }
1078 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1079 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1080 }
1081
1082 // AlwaysTenure flag should make ParNew promote all at first collection.
1083 // See CR 6362902.
1084 if (AlwaysTenure) {
1085 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1086 }
1087 // When using compressed oops, we use local overflow stacks,
1088 // rather than using a global overflow list chained through
1089 // the klass word of the object's pre-image.
1090 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1091 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1092 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1093 }
1094 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1095 }
1096 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1097 }
1098 }
1099
1100 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1101 // sparc/solaris for certain applications, but would gain from
1102 // further optimization and tuning efforts, and would almost
1103 // certainly gain from analysis of platform and environment.
1104 void Arguments::set_cms_and_parnew_gc_flags() {
1105 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1106 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1107
1108 // If we are using CMS, we prefer to UseParNewGC,
1109 // unless explicitly forbidden.
1110 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1111 FLAG_SET_ERGO(bool, UseParNewGC, true);
1112 }
1113
1114 // Turn off AdaptiveSizePolicy by default for cms until it is
1115 // complete.
1116 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1117 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1118 }
1119
1120 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1121 // as needed.
1122 if (UseParNewGC) {
1123 set_parnew_gc_flags();
1124 }
1125
1126 // Now make adjustments for CMS
1127 size_t young_gen_per_worker;
1128 intx new_ratio;
1129 size_t min_new_default;
1130 intx tenuring_default;
1131 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1132 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1133 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1134 }
1135 young_gen_per_worker = 4*M;
1136 new_ratio = (intx)15;
1137 min_new_default = 4*M;
1138 tenuring_default = (intx)0;
1139 } else { // new defaults: "new" as of 6.0
1140 young_gen_per_worker = CMSYoungGenPerWorker;
1141 new_ratio = (intx)7;
1142 min_new_default = 16*M;
1143 tenuring_default = (intx)4;
1144 }
1145
1146 // Preferred young gen size for "short" pauses
1147 const uintx parallel_gc_threads =
1148 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1149 const size_t preferred_max_new_size_unaligned =
1150 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1151 const size_t preferred_max_new_size =
1152 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1153
1154 // Unless explicitly requested otherwise, size young gen
1155 // for "short" pauses ~ 4M*ParallelGCThreads
1156
1157 // If either MaxNewSize or NewRatio is set on the command line,
1158 // assume the user is trying to set the size of the young gen.
1159
1160 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1161
1162 // Set MaxNewSize to our calculated preferred_max_new_size unless
1163 // NewSize was set on the command line and it is larger than
1164 // preferred_max_new_size.
1165 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1166 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1167 } else {
1168 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1169 }
1170 if (PrintGCDetails && Verbose) {
1171 // Too early to use gclog_or_tty
1172 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1173 }
1174
1175 // Unless explicitly requested otherwise, prefer a large
1176 // Old to Young gen size so as to shift the collection load
1177 // to the old generation concurrent collector
1178
1179 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1180 // then NewSize and OldSize may be calculated. That would
1181 // generally lead to some differences with ParNewGC for which
1182 // there was no obvious reason. Also limit to the case where
1183 // MaxNewSize has not been set.
1184
1185 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1186
1187 // Code along this path potentially sets NewSize and OldSize
1188
1189 // Calculate the desired minimum size of the young gen but if
1190 // NewSize has been set on the command line, use it here since
1191 // it should be the final value.
1192 size_t min_new;
1193 if (FLAG_IS_DEFAULT(NewSize)) {
1194 min_new = align_size_up(ScaleForWordSize(min_new_default),
1195 os::vm_page_size());
1196 } else {
1197 min_new = NewSize;
1198 }
1199 size_t prev_initial_size = InitialHeapSize;
1200 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1201 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1202 // Currently minimum size and the initial heap sizes are the same.
1203 set_min_heap_size(InitialHeapSize);
1204 if (PrintGCDetails && Verbose) {
1205 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1206 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1207 InitialHeapSize/M, prev_initial_size/M);
1208 }
1209 }
1210
1211 // MaxHeapSize is aligned down in collectorPolicy
1212 size_t max_heap =
1213 align_size_down(MaxHeapSize,
1214 CardTableRS::ct_max_alignment_constraint());
1215
1216 if (PrintGCDetails && Verbose) {
1217 // Too early to use gclog_or_tty
1218 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1219 " initial_heap_size: " SIZE_FORMAT
1220 " max_heap: " SIZE_FORMAT,
1221 min_heap_size(), InitialHeapSize, max_heap);
1222 }
1223 if (max_heap > min_new) {
1224 // Unless explicitly requested otherwise, make young gen
1225 // at least min_new, and at most preferred_max_new_size.
1226 if (FLAG_IS_DEFAULT(NewSize)) {
1227 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1228 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1229 if (PrintGCDetails && Verbose) {
1230 // Too early to use gclog_or_tty
1231 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1232 }
1233 }
1234 // Unless explicitly requested otherwise, size old gen
1235 // so that it's at least 3X of NewSize to begin with;
1236 // later NewRatio will decide how it grows; see above.
1237 if (FLAG_IS_DEFAULT(OldSize)) {
1238 if (max_heap > NewSize) {
1239 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1240 if (PrintGCDetails && Verbose) {
1241 // Too early to use gclog_or_tty
1242 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1243 }
1244 }
1245 }
1246 }
1247 }
1248 // Unless explicitly requested otherwise, definitely
1249 // promote all objects surviving "tenuring_default" scavenges.
1250 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1251 FLAG_IS_DEFAULT(SurvivorRatio)) {
1252 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1253 }
1254 // If we decided above (or user explicitly requested)
1255 // `promote all' (via MaxTenuringThreshold := 0),
1256 // prefer minuscule survivor spaces so as not to waste
1257 // space for (non-existent) survivors
1258 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1259 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1260 }
1261 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1262 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1263 // This is done in order to make ParNew+CMS configuration to work
1264 // with YoungPLABSize and OldPLABSize options.
1265 // See CR 6362902.
1266 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1267 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1268 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1269 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1270 // the value (either from the command line or ergonomics) of
1271 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1272 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1273 } else {
1274 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1275 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1276 // we'll let it to take precedence.
1277 jio_fprintf(defaultStream::error_stream(),
1278 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1279 " options are specified for the CMS collector."
1280 " CMSParPromoteBlocksToClaim will take precedence.\n");
1281 }
1282 }
1283 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1284 // OldPLAB sizing manually turned off: Use a larger default setting,
1285 // unless it was manually specified. This is because a too-low value
1286 // will slow down scavenges.
1287 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1288 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1289 }
1290 }
1291 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1292 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1293 // If either of the static initialization defaults have changed, note this
1294 // modification.
1295 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1296 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1297 }
1298 if (PrintGCDetails && Verbose) {
1299 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1300 MarkStackSize / K, MarkStackSizeMax / K);
1301 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1302 }
1303 }
1304 #endif // KERNEL
1305
1306 void set_object_alignment() {
1307 // Object alignment.
1308 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1309 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1310 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1311 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1312 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1313 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1314
1315 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1316 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1317
1318 // Oop encoding heap max
1319 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1320
1321 #ifndef KERNEL
1322 // Set CMS global values
1323 CompactibleFreeListSpace::set_cms_values();
1324 #endif // KERNEL
1325 }
1326
1327 bool verify_object_alignment() {
1328 // Object alignment.
1329 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1330 jio_fprintf(defaultStream::error_stream(),
1331 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1332 (int)ObjectAlignmentInBytes);
1333 return false;
1334 }
1335 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1336 jio_fprintf(defaultStream::error_stream(),
1337 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1338 (int)ObjectAlignmentInBytes, BytesPerLong);
1339 return false;
1340 }
1341 // It does not make sense to have big object alignment
1342 // since a space lost due to alignment will be greater
1343 // then a saved space from compressed oops.
1344 if ((int)ObjectAlignmentInBytes > 256) {
1345 jio_fprintf(defaultStream::error_stream(),
1346 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1347 (int)ObjectAlignmentInBytes);
1348 return false;
1349 }
1350 // In case page size is very small.
1351 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1352 jio_fprintf(defaultStream::error_stream(),
1353 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1354 (int)ObjectAlignmentInBytes, os::vm_page_size());
1355 return false;
1356 }
1357 return true;
1358 }
1359
1360 inline uintx max_heap_for_compressed_oops() {
1361 // Avoid sign flip.
1362 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1363 return 0;
1364 }
1365 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1366 NOT_LP64(ShouldNotReachHere(); return 0);
1367 }
1368
1369 bool Arguments::should_auto_select_low_pause_collector() {
1370 if (UseAutoGCSelectPolicy &&
1371 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1372 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1373 if (PrintGCDetails) {
1374 // Cannot use gclog_or_tty yet.
1375 tty->print_cr("Automatic selection of the low pause collector"
1376 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1377 }
1378 return true;
1379 }
1380 return false;
1381 }
1382
1383 void Arguments::set_ergonomics_flags() {
1384 // Parallel GC is not compatible with sharing. If one specifies
1385 // that they want sharing explicitly, do not set ergonomics flags.
1386 if (DumpSharedSpaces || ForceSharedSpaces) {
1387 return;
1388 }
1389
1390 if (os::is_server_class_machine() && !force_client_mode ) {
1391 // If no other collector is requested explicitly,
1392 // let the VM select the collector based on
1393 // machine class and automatic selection policy.
1394 if (!UseSerialGC &&
1395 !UseConcMarkSweepGC &&
1396 !UseG1GC &&
1397 !UseParNewGC &&
1398 !DumpSharedSpaces &&
1399 FLAG_IS_DEFAULT(UseParallelGC)) {
1400 if (should_auto_select_low_pause_collector()) {
1401 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1402 } else {
1403 FLAG_SET_ERGO(bool, UseParallelGC, true);
1404 }
1405 no_shared_spaces();
1406 }
1407 }
1408
1409 #ifndef ZERO
1410 #ifdef _LP64
1411 // Check that UseCompressedOops can be set with the max heap size allocated
1412 // by ergonomics.
1413 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1414 #if !defined(COMPILER1) || defined(TIERED)
1415 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1416 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1417 }
1418 #endif
1419 #ifdef _WIN64
1420 if (UseLargePages && UseCompressedOops) {
1421 // Cannot allocate guard pages for implicit checks in indexed addressing
1422 // mode, when large pages are specified on windows.
1423 // This flag could be switched ON if narrow oop base address is set to 0,
1424 // see code in Universe::initialize_heap().
1425 Universe::set_narrow_oop_use_implicit_null_checks(false);
1426 }
1427 #endif // _WIN64
1428 } else {
1429 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1430 warning("Max heap size too large for Compressed Oops");
1431 FLAG_SET_DEFAULT(UseCompressedOops, false);
1432 }
1433 }
1434 // Also checks that certain machines are slower with compressed oops
1435 // in vm_version initialization code.
1436 #endif // _LP64
1437 #endif // !ZERO
1438 }
1439
1440 void Arguments::set_parallel_gc_flags() {
1441 assert(UseParallelGC || UseParallelOldGC, "Error");
1442 // If parallel old was requested, automatically enable parallel scavenge.
1443 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1444 FLAG_SET_DEFAULT(UseParallelGC, true);
1445 }
1446
1447 // If no heap maximum was requested explicitly, use some reasonable fraction
1448 // of the physical memory, up to a maximum of 1GB.
1449 if (UseParallelGC) {
1450 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1451 Abstract_VM_Version::parallel_worker_threads());
1452
1453 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1454 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1455 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1456 // See CR 6362902 for details.
1457 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1458 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1459 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1460 }
1461 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1462 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1463 }
1464 }
1465
1466 if (UseParallelOldGC) {
1467 // Par compact uses lower default values since they are treated as
1468 // minimums. These are different defaults because of the different
1469 // interpretation and are not ergonomically set.
1470 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1471 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1472 }
1473 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1474 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1475 }
1476 }
1477 }
1478 }
1479
1480 void Arguments::set_g1_gc_flags() {
1481 assert(UseG1GC, "Error");
1482 #ifdef COMPILER1
1483 FastTLABRefill = false;
1484 #endif
1485 FLAG_SET_DEFAULT(ParallelGCThreads,
1486 Abstract_VM_Version::parallel_worker_threads());
1487 if (ParallelGCThreads == 0) {
1488 FLAG_SET_DEFAULT(ParallelGCThreads,
1489 Abstract_VM_Version::parallel_worker_threads());
1490 }
1491 no_shared_spaces();
1492
1493 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1494 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1495 }
1496 if (PrintGCDetails && Verbose) {
1497 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1498 MarkStackSize / K, MarkStackSizeMax / K);
1499 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1500 }
1501
1502 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1503 // In G1, we want the default GC overhead goal to be higher than
1504 // say in PS. So we set it here to 10%. Otherwise the heap might
1505 // be expanded more aggressively than we would like it to. In
1506 // fact, even 10% seems to not be high enough in some cases
1507 // (especially small GC stress tests that the main thing they do
1508 // is allocation). We might consider increase it further.
1509 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1510 }
1511 }
1512
1513 void Arguments::set_heap_size() {
1514 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1515 // Deprecated flag
1516 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1517 }
1518
1519 const julong phys_mem =
1520 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1521 : (julong)MaxRAM;
1522
1523 // If the maximum heap size has not been set with -Xmx,
1524 // then set it as fraction of the size of physical memory,
1525 // respecting the maximum and minimum sizes of the heap.
1526 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1527 julong reasonable_max = phys_mem / MaxRAMFraction;
1528
1529 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1530 // Small physical memory, so use a minimum fraction of it for the heap
1531 reasonable_max = phys_mem / MinRAMFraction;
1532 } else {
1533 // Not-small physical memory, so require a heap at least
1534 // as large as MaxHeapSize
1535 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1536 }
1537 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1538 // Limit the heap size to ErgoHeapSizeLimit
1539 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1540 }
1541 if (UseCompressedOops) {
1542 // Limit the heap size to the maximum possible when using compressed oops
1543 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1544 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1545 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1546 // but it should be not less than default MaxHeapSize.
1547 max_coop_heap -= HeapBaseMinAddress;
1548 }
1549 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1550 }
1551 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1552
1553 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1554 // An initial heap size was specified on the command line,
1555 // so be sure that the maximum size is consistent. Done
1556 // after call to allocatable_physical_memory because that
1557 // method might reduce the allocation size.
1558 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1559 }
1560
1561 if (PrintGCDetails && Verbose) {
1562 // Cannot use gclog_or_tty yet.
1563 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1564 }
1565 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1566 }
1567
1568 // If the initial_heap_size has not been set with InitialHeapSize
1569 // or -Xms, then set it as fraction of the size of physical memory,
1570 // respecting the maximum and minimum sizes of the heap.
1571 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1572 julong reasonable_minimum = (julong)(OldSize + NewSize);
1573
1574 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1575
1576 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1577
1578 julong reasonable_initial = phys_mem / InitialRAMFraction;
1579
1580 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1581 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1582
1583 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1584
1585 if (PrintGCDetails && Verbose) {
1586 // Cannot use gclog_or_tty yet.
1587 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1588 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1589 }
1590 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1591 set_min_heap_size((uintx)reasonable_minimum);
1592 }
1593 }
1594
1595 // This must be called after ergonomics because we want bytecode rewriting
1596 // if the server compiler is used, or if UseSharedSpaces is disabled.
1597 void Arguments::set_bytecode_flags() {
1598 // Better not attempt to store into a read-only space.
1599 if (UseSharedSpaces) {
1600 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1601 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1602 }
1603
1604 if (!RewriteBytecodes) {
1605 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1606 }
1607 }
1608
1609 // Aggressive optimization flags -XX:+AggressiveOpts
1610 void Arguments::set_aggressive_opts_flags() {
1611 #ifdef COMPILER2
1612 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1613 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1614 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1615 }
1616 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1617 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1618 }
1619
1620 // Feed the cache size setting into the JDK
1621 char buffer[1024];
1622 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1623 add_property(buffer);
1624 }
1625 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1626 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1627 }
1628 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1629 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1630 }
1631 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1632 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1633 }
1634 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1635 FLAG_SET_DEFAULT(OptimizeFill, true);
1636 }
1637 #endif
1638
1639 if (AggressiveOpts) {
1640 // Sample flag setting code
1641 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1642 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1643 // }
1644 }
1645 }
1646
1647 //===========================================================================================================
1648 // Parsing of java.compiler property
1649
1650 void Arguments::process_java_compiler_argument(char* arg) {
1651 // For backwards compatibility, Djava.compiler=NONE or ""
1652 // causes us to switch to -Xint mode UNLESS -Xdebug
1653 // is also specified.
1654 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1655 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1656 }
1657 }
1658
1659 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1660 _sun_java_launcher = strdup(launcher);
1661 }
1662
1663 bool Arguments::created_by_java_launcher() {
1664 assert(_sun_java_launcher != NULL, "property must have value");
1665 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1666 }
1667
1668 //===========================================================================================================
1669 // Parsing of main arguments
1670
1671 bool Arguments::verify_interval(uintx val, uintx min,
1672 uintx max, const char* name) {
1673 // Returns true iff value is in the inclusive interval [min..max]
1674 // false, otherwise.
1675 if (val >= min && val <= max) {
1676 return true;
1677 }
1678 jio_fprintf(defaultStream::error_stream(),
1679 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1680 " and " UINTX_FORMAT "\n",
1681 name, val, min, max);
1682 return false;
1683 }
1684
1685 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1686 // Returns true if given value is greater than specified min threshold
1687 // false, otherwise.
1688 if (val >= min ) {
1689 return true;
1690 }
1691 jio_fprintf(defaultStream::error_stream(),
1692 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1693 name, val, min);
1694 return false;
1695 }
1696
1697 bool Arguments::verify_percentage(uintx value, const char* name) {
1698 if (value <= 100) {
1699 return true;
1700 }
1701 jio_fprintf(defaultStream::error_stream(),
1702 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1703 name, value);
1704 return false;
1705 }
1706
1707 static void force_serial_gc() {
1708 FLAG_SET_DEFAULT(UseSerialGC, true);
1709 FLAG_SET_DEFAULT(UseParNewGC, false);
1710 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1711 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1712 FLAG_SET_DEFAULT(UseParallelGC, false);
1713 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1714 FLAG_SET_DEFAULT(UseG1GC, false);
1715 }
1716
1717 static bool verify_serial_gc_flags() {
1718 return (UseSerialGC &&
1719 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1720 UseParallelGC || UseParallelOldGC));
1721 }
1722
1723 // Check consistency of GC selection
1724 bool Arguments::check_gc_consistency() {
1725 bool status = true;
1726 // Ensure that the user has not selected conflicting sets
1727 // of collectors. [Note: this check is merely a user convenience;
1728 // collectors over-ride each other so that only a non-conflicting
1729 // set is selected; however what the user gets is not what they
1730 // may have expected from the combination they asked for. It's
1731 // better to reduce user confusion by not allowing them to
1732 // select conflicting combinations.
1733 uint i = 0;
1734 if (UseSerialGC) i++;
1735 if (UseConcMarkSweepGC || UseParNewGC) i++;
1736 if (UseParallelGC || UseParallelOldGC) i++;
1737 if (UseG1GC) i++;
1738 if (i > 1) {
1739 jio_fprintf(defaultStream::error_stream(),
1740 "Conflicting collector combinations in option list; "
1741 "please refer to the release notes for the combinations "
1742 "allowed\n");
1743 status = false;
1744 }
1745
1746 return status;
1747 }
1748
1749 // Check stack pages settings
1750 bool Arguments::check_stack_pages()
1751 {
1752 bool status = true;
1753 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1754 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1755 // greater stack shadow pages can't generate instruction to bang stack
1756 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1757 return status;
1758 }
1759
1760 // Check the consistency of vm_init_args
1761 bool Arguments::check_vm_args_consistency() {
1762 // Method for adding checks for flag consistency.
1763 // The intent is to warn the user of all possible conflicts,
1764 // before returning an error.
1765 // Note: Needs platform-dependent factoring.
1766 bool status = true;
1767
1768 #if ( (defined(COMPILER2) && defined(SPARC)))
1769 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1770 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1771 // x86. Normally, VM_Version_init must be called from init_globals in
1772 // init.cpp, which is called by the initial java thread *after* arguments
1773 // have been parsed. VM_Version_init gets called twice on sparc.
1774 extern void VM_Version_init();
1775 VM_Version_init();
1776 if (!VM_Version::has_v9()) {
1777 jio_fprintf(defaultStream::error_stream(),
1778 "V8 Machine detected, Server requires V9\n");
1779 status = false;
1780 }
1781 #endif /* COMPILER2 && SPARC */
1782
1783 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1784 // builds so the cost of stack banging can be measured.
1785 #if (defined(PRODUCT) && defined(SOLARIS))
1786 if (!UseBoundThreads && !UseStackBanging) {
1787 jio_fprintf(defaultStream::error_stream(),
1788 "-UseStackBanging conflicts with -UseBoundThreads\n");
1789
1790 status = false;
1791 }
1792 #endif
1793
1794 if (TLABRefillWasteFraction == 0) {
1795 jio_fprintf(defaultStream::error_stream(),
1796 "TLABRefillWasteFraction should be a denominator, "
1797 "not " SIZE_FORMAT "\n",
1798 TLABRefillWasteFraction);
1799 status = false;
1800 }
1801
1802 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1803 "AdaptiveSizePolicyWeight");
1804 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1805 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1806 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1807 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1808
1809 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1810 jio_fprintf(defaultStream::error_stream(),
1811 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1812 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1813 MinHeapFreeRatio, MaxHeapFreeRatio);
1814 status = false;
1815 }
1816 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1817 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1818
1819 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1820 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1821 }
1822
1823 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1824 // Settings to encourage splitting.
1825 if (!FLAG_IS_CMDLINE(NewRatio)) {
1826 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1827 }
1828 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1829 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1830 }
1831 }
1832
1833 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1834 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1835 if (GCTimeLimit == 100) {
1836 // Turn off gc-overhead-limit-exceeded checks
1837 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1838 }
1839
1840 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1841
1842 // Check whether user-specified sharing option conflicts with GC or page size.
1843 // Both sharing and large pages are enabled by default on some platforms;
1844 // large pages override sharing only if explicitly set on the command line.
1845 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1846 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1847 UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1848 if (cannot_share) {
1849 // Either force sharing on by forcing the other options off, or
1850 // force sharing off.
1851 if (DumpSharedSpaces || ForceSharedSpaces) {
1852 jio_fprintf(defaultStream::error_stream(),
1853 "Using Serial GC and default page size because of %s\n",
1854 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1855 force_serial_gc();
1856 FLAG_SET_DEFAULT(UseLargePages, false);
1857 } else {
1858 if (UseSharedSpaces && Verbose) {
1859 jio_fprintf(defaultStream::error_stream(),
1860 "Turning off use of shared archive because of "
1861 "choice of garbage collector or large pages\n");
1862 }
1863 no_shared_spaces();
1864 }
1865 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1866 FLAG_SET_DEFAULT(UseLargePages, false);
1867 }
1868
1869 status = status && check_gc_consistency();
1870 status = status && check_stack_pages();
1871
1872 if (_has_alloc_profile) {
1873 if (UseParallelGC || UseParallelOldGC) {
1874 jio_fprintf(defaultStream::error_stream(),
1875 "error: invalid argument combination.\n"
1876 "Allocation profiling (-Xaprof) cannot be used together with "
1877 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1878 status = false;
1879 }
1880 if (UseConcMarkSweepGC) {
1881 jio_fprintf(defaultStream::error_stream(),
1882 "error: invalid argument combination.\n"
1883 "Allocation profiling (-Xaprof) cannot be used together with "
1884 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1885 status = false;
1886 }
1887 }
1888
1889 if (CMSIncrementalMode) {
1890 if (!UseConcMarkSweepGC) {
1891 jio_fprintf(defaultStream::error_stream(),
1892 "error: invalid argument combination.\n"
1893 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1894 "selected in order\nto use CMSIncrementalMode.\n");
1895 status = false;
1896 } else {
1897 status = status && verify_percentage(CMSIncrementalDutyCycle,
1898 "CMSIncrementalDutyCycle");
1899 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1900 "CMSIncrementalDutyCycleMin");
1901 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1902 "CMSIncrementalSafetyFactor");
1903 status = status && verify_percentage(CMSIncrementalOffset,
1904 "CMSIncrementalOffset");
1905 status = status && verify_percentage(CMSExpAvgFactor,
1906 "CMSExpAvgFactor");
1907 // If it was not set on the command line, set
1908 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1909 if (CMSInitiatingOccupancyFraction < 0) {
1910 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1911 }
1912 }
1913 }
1914
1915 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1916 // insists that we hold the requisite locks so that the iteration is
1917 // MT-safe. For the verification at start-up and shut-down, we don't
1918 // yet have a good way of acquiring and releasing these locks,
1919 // which are not visible at the CollectedHeap level. We want to
1920 // be able to acquire these locks and then do the iteration rather
1921 // than just disable the lock verification. This will be fixed under
1922 // bug 4788986.
1923 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1924 if (VerifyGCStartAt == 0) {
1925 warning("Heap verification at start-up disabled "
1926 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1927 VerifyGCStartAt = 1; // Disable verification at start-up
1928 }
1929 if (VerifyBeforeExit) {
1930 warning("Heap verification at shutdown disabled "
1931 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1932 VerifyBeforeExit = false; // Disable verification at shutdown
1933 }
1934 }
1935
1936 // Note: only executed in non-PRODUCT mode
1937 if (!UseAsyncConcMarkSweepGC &&
1938 (ExplicitGCInvokesConcurrent ||
1939 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1940 jio_fprintf(defaultStream::error_stream(),
1941 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1942 " with -UseAsyncConcMarkSweepGC");
1943 status = false;
1944 }
1945
1946 if (UseG1GC) {
1947 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1948 "InitiatingHeapOccupancyPercent");
1949 }
1950
1951 status = status && verify_interval(RefDiscoveryPolicy,
1952 ReferenceProcessor::DiscoveryPolicyMin,
1953 ReferenceProcessor::DiscoveryPolicyMax,
1954 "RefDiscoveryPolicy");
1955
1956 // Limit the lower bound of this flag to 1 as it is used in a division
1957 // expression.
1958 status = status && verify_interval(TLABWasteTargetPercent,
1959 1, 100, "TLABWasteTargetPercent");
1960
1961 status = status && verify_object_alignment();
1962
1963 return status;
1964 }
1965
1966 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1967 const char* option_type) {
1968 if (ignore) return false;
1969
1970 const char* spacer = " ";
1971 if (option_type == NULL) {
1972 option_type = ++spacer; // Set both to the empty string.
1973 }
1974
1975 if (os::obsolete_option(option)) {
1976 jio_fprintf(defaultStream::error_stream(),
1977 "Obsolete %s%soption: %s\n", option_type, spacer,
1978 option->optionString);
1979 return false;
1980 } else {
1981 jio_fprintf(defaultStream::error_stream(),
1982 "Unrecognized %s%soption: %s\n", option_type, spacer,
1983 option->optionString);
1984 return true;
1985 }
1986 }
1987
1988 static const char* user_assertion_options[] = {
1989 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1990 };
1991
1992 static const char* system_assertion_options[] = {
1993 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1994 };
1995
1996 // Return true if any of the strings in null-terminated array 'names' matches.
1997 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1998 // the option must match exactly.
1999 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2000 bool tail_allowed) {
2001 for (/* empty */; *names != NULL; ++names) {
2002 if (match_option(option, *names, tail)) {
2003 if (**tail == '\0' || tail_allowed && **tail == ':') {
2004 return true;
2005 }
2006 }
2007 }
2008 return false;
2009 }
2010
2011 bool Arguments::parse_uintx(const char* value,
2012 uintx* uintx_arg,
2013 uintx min_size) {
2014
2015 // Check the sign first since atomull() parses only unsigned values.
2016 bool value_is_positive = !(*value == '-');
2017
2018 if (value_is_positive) {
2019 julong n;
2020 bool good_return = atomull(value, &n);
2021 if (good_return) {
2022 bool above_minimum = n >= min_size;
2023 bool value_is_too_large = n > max_uintx;
2024
2025 if (above_minimum && !value_is_too_large) {
2026 *uintx_arg = n;
2027 return true;
2028 }
2029 }
2030 }
2031 return false;
2032 }
2033
2034 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2035 julong* long_arg,
2036 julong min_size) {
2037 if (!atomull(s, long_arg)) return arg_unreadable;
2038 return check_memory_size(*long_arg, min_size);
2039 }
2040
2041 // Parse JavaVMInitArgs structure
2042
2043 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2044 // For components of the system classpath.
2045 SysClassPath scp(Arguments::get_sysclasspath());
2046 bool scp_assembly_required = false;
2047
2048 // Save default settings for some mode flags
2049 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2050 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2051 Arguments::_ClipInlining = ClipInlining;
2052 Arguments::_BackgroundCompilation = BackgroundCompilation;
2053
2054 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2055 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2056 if (result != JNI_OK) {
2057 return result;
2058 }
2059
2060 // Parse JavaVMInitArgs structure passed in
2061 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2062 if (result != JNI_OK) {
2063 return result;
2064 }
2065
2066 if (AggressiveOpts) {
2067 // Insert alt-rt.jar between user-specified bootclasspath
2068 // prefix and the default bootclasspath. os::set_boot_path()
2069 // uses meta_index_dir as the default bootclasspath directory.
2070 const char* altclasses_jar = "alt-rt.jar";
2071 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2072 strlen(altclasses_jar);
2073 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2074 strcpy(altclasses_path, get_meta_index_dir());
2075 strcat(altclasses_path, altclasses_jar);
2076 scp.add_suffix_to_prefix(altclasses_path);
2077 scp_assembly_required = true;
2078 FREE_C_HEAP_ARRAY(char, altclasses_path);
2079 }
2080
2081 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2082 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2083 if (result != JNI_OK) {
2084 return result;
2085 }
2086
2087 // Do final processing now that all arguments have been parsed
2088 result = finalize_vm_init_args(&scp, scp_assembly_required);
2089 if (result != JNI_OK) {
2090 return result;
2091 }
2092
2093 return JNI_OK;
2094 }
2095
2096 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2097 SysClassPath* scp_p,
2098 bool* scp_assembly_required_p,
2099 FlagValueOrigin origin) {
2100 // Remaining part of option string
2101 const char* tail;
2102
2103 // iterate over arguments
2104 for (int index = 0; index < args->nOptions; index++) {
2105 bool is_absolute_path = false; // for -agentpath vs -agentlib
2106
2107 const JavaVMOption* option = args->options + index;
2108
2109 if (!match_option(option, "-Djava.class.path", &tail) &&
2110 !match_option(option, "-Dsun.java.command", &tail) &&
2111 !match_option(option, "-Dsun.java.launcher", &tail)) {
2112
2113 // add all jvm options to the jvm_args string. This string
2114 // is used later to set the java.vm.args PerfData string constant.
2115 // the -Djava.class.path and the -Dsun.java.command options are
2116 // omitted from jvm_args string as each have their own PerfData
2117 // string constant object.
2118 build_jvm_args(option->optionString);
2119 }
2120
2121 // -verbose:[class/gc/jni]
2122 if (match_option(option, "-verbose", &tail)) {
2123 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2124 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2125 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2126 } else if (!strcmp(tail, ":gc")) {
2127 FLAG_SET_CMDLINE(bool, PrintGC, true);
2128 } else if (!strcmp(tail, ":jni")) {
2129 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2130 }
2131 // -da / -ea / -disableassertions / -enableassertions
2132 // These accept an optional class/package name separated by a colon, e.g.,
2133 // -da:java.lang.Thread.
2134 } else if (match_option(option, user_assertion_options, &tail, true)) {
2135 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2136 if (*tail == '\0') {
2137 JavaAssertions::setUserClassDefault(enable);
2138 } else {
2139 assert(*tail == ':', "bogus match by match_option()");
2140 JavaAssertions::addOption(tail + 1, enable);
2141 }
2142 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2143 } else if (match_option(option, system_assertion_options, &tail, false)) {
2144 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2145 JavaAssertions::setSystemClassDefault(enable);
2146 // -bootclasspath:
2147 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2148 scp_p->reset_path(tail);
2149 *scp_assembly_required_p = true;
2150 // -bootclasspath/a:
2151 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2152 scp_p->add_suffix(tail);
2153 *scp_assembly_required_p = true;
2154 // -bootclasspath/p:
2155 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2156 scp_p->add_prefix(tail);
2157 *scp_assembly_required_p = true;
2158 // -Xrun
2159 } else if (match_option(option, "-Xrun", &tail)) {
2160 if (tail != NULL) {
2161 const char* pos = strchr(tail, ':');
2162 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2163 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2164 name[len] = '\0';
2165
2166 char *options = NULL;
2167 if(pos != NULL) {
2168 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2169 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2170 }
2171 #ifdef JVMTI_KERNEL
2172 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2173 warning("profiling and debugging agents are not supported with Kernel VM");
2174 } else
2175 #endif // JVMTI_KERNEL
2176 add_init_library(name, options);
2177 }
2178 // -agentlib and -agentpath
2179 } else if (match_option(option, "-agentlib:", &tail) ||
2180 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2181 if(tail != NULL) {
2182 const char* pos = strchr(tail, '=');
2183 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2184 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2185 name[len] = '\0';
2186
2187 char *options = NULL;
2188 if(pos != NULL) {
2189 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2190 }
2191 #ifdef JVMTI_KERNEL
2192 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2193 warning("profiling and debugging agents are not supported with Kernel VM");
2194 } else
2195 #endif // JVMTI_KERNEL
2196 add_init_agent(name, options, is_absolute_path);
2197
2198 }
2199 // -javaagent
2200 } else if (match_option(option, "-javaagent:", &tail)) {
2201 if(tail != NULL) {
2202 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2203 add_init_agent("instrument", options, false);
2204 }
2205 // -Xnoclassgc
2206 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2207 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2208 // -Xincgc: i-CMS
2209 } else if (match_option(option, "-Xincgc", &tail)) {
2210 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2211 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2212 // -Xnoincgc: no i-CMS
2213 } else if (match_option(option, "-Xnoincgc", &tail)) {
2214 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2215 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2216 // -Xconcgc
2217 } else if (match_option(option, "-Xconcgc", &tail)) {
2218 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2219 // -Xnoconcgc
2220 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2221 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2222 // -Xbatch
2223 } else if (match_option(option, "-Xbatch", &tail)) {
2224 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2225 // -Xmn for compatibility with other JVM vendors
2226 } else if (match_option(option, "-Xmn", &tail)) {
2227 julong long_initial_eden_size = 0;
2228 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2229 if (errcode != arg_in_range) {
2230 jio_fprintf(defaultStream::error_stream(),
2231 "Invalid initial eden size: %s\n", option->optionString);
2232 describe_range_error(errcode);
2233 return JNI_EINVAL;
2234 }
2235 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2236 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2237 // -Xms
2238 } else if (match_option(option, "-Xms", &tail)) {
2239 julong long_initial_heap_size = 0;
2240 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2241 if (errcode != arg_in_range) {
2242 jio_fprintf(defaultStream::error_stream(),
2243 "Invalid initial heap size: %s\n", option->optionString);
2244 describe_range_error(errcode);
2245 return JNI_EINVAL;
2246 }
2247 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2248 // Currently the minimum size and the initial heap sizes are the same.
2249 set_min_heap_size(InitialHeapSize);
2250 // -Xmx
2251 } else if (match_option(option, "-Xmx", &tail)) {
2252 julong long_max_heap_size = 0;
2253 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2254 if (errcode != arg_in_range) {
2255 jio_fprintf(defaultStream::error_stream(),
2256 "Invalid maximum heap size: %s\n", option->optionString);
2257 describe_range_error(errcode);
2258 return JNI_EINVAL;
2259 }
2260 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2261 // Xmaxf
2262 } else if (match_option(option, "-Xmaxf", &tail)) {
2263 int maxf = (int)(atof(tail) * 100);
2264 if (maxf < 0 || maxf > 100) {
2265 jio_fprintf(defaultStream::error_stream(),
2266 "Bad max heap free percentage size: %s\n",
2267 option->optionString);
2268 return JNI_EINVAL;
2269 } else {
2270 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2271 }
2272 // Xminf
2273 } else if (match_option(option, "-Xminf", &tail)) {
2274 int minf = (int)(atof(tail) * 100);
2275 if (minf < 0 || minf > 100) {
2276 jio_fprintf(defaultStream::error_stream(),
2277 "Bad min heap free percentage size: %s\n",
2278 option->optionString);
2279 return JNI_EINVAL;
2280 } else {
2281 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2282 }
2283 // -Xss
2284 } else if (match_option(option, "-Xss", &tail)) {
2285 julong long_ThreadStackSize = 0;
2286 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2287 if (errcode != arg_in_range) {
2288 jio_fprintf(defaultStream::error_stream(),
2289 "Invalid thread stack size: %s\n", option->optionString);
2290 describe_range_error(errcode);
2291 return JNI_EINVAL;
2292 }
2293 // Internally track ThreadStackSize in units of 1024 bytes.
2294 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2295 round_to((int)long_ThreadStackSize, K) / K);
2296 // -Xoss
2297 } else if (match_option(option, "-Xoss", &tail)) {
2298 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2299 // -Xmaxjitcodesize
2300 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2301 julong long_ReservedCodeCacheSize = 0;
2302 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2303 (size_t)InitialCodeCacheSize);
2304 if (errcode != arg_in_range) {
2305 jio_fprintf(defaultStream::error_stream(),
2306 "Invalid maximum code cache size: %s\n",
2307 option->optionString);
2308 describe_range_error(errcode);
2309 return JNI_EINVAL;
2310 }
2311 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2312 // -green
2313 } else if (match_option(option, "-green", &tail)) {
2314 jio_fprintf(defaultStream::error_stream(),
2315 "Green threads support not available\n");
2316 return JNI_EINVAL;
2317 // -native
2318 } else if (match_option(option, "-native", &tail)) {
2319 // HotSpot always uses native threads, ignore silently for compatibility
2320 // -Xsqnopause
2321 } else if (match_option(option, "-Xsqnopause", &tail)) {
2322 // EVM option, ignore silently for compatibility
2323 // -Xrs
2324 } else if (match_option(option, "-Xrs", &tail)) {
2325 // Classic/EVM option, new functionality
2326 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2327 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2328 // change default internal VM signals used - lower case for back compat
2329 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2330 // -Xoptimize
2331 } else if (match_option(option, "-Xoptimize", &tail)) {
2332 // EVM option, ignore silently for compatibility
2333 // -Xprof
2334 } else if (match_option(option, "-Xprof", &tail)) {
2335 #ifndef FPROF_KERNEL
2336 _has_profile = true;
2337 #else // FPROF_KERNEL
2338 // do we have to exit?
2339 warning("Kernel VM does not support flat profiling.");
2340 #endif // FPROF_KERNEL
2341 // -Xaprof
2342 } else if (match_option(option, "-Xaprof", &tail)) {
2343 _has_alloc_profile = true;
2344 // -Xconcurrentio
2345 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2346 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2347 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2348 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2349 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2350 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2351
2352 // -Xinternalversion
2353 } else if (match_option(option, "-Xinternalversion", &tail)) {
2354 jio_fprintf(defaultStream::output_stream(), "%s\n",
2355 VM_Version::internal_vm_info_string());
2356 vm_exit(0);
2357 #ifndef PRODUCT
2358 // -Xprintflags
2359 } else if (match_option(option, "-Xprintflags", &tail)) {
2360 CommandLineFlags::printFlags();
2361 vm_exit(0);
2362 #endif
2363 // -D
2364 } else if (match_option(option, "-D", &tail)) {
2365 if (!add_property(tail)) {
2366 return JNI_ENOMEM;
2367 }
2368 // Out of the box management support
2369 if (match_option(option, "-Dcom.sun.management", &tail)) {
2370 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2371 }
2372 // -Xint
2373 } else if (match_option(option, "-Xint", &tail)) {
2374 set_mode_flags(_int);
2375 // -Xmixed
2376 } else if (match_option(option, "-Xmixed", &tail)) {
2377 set_mode_flags(_mixed);
2378 // -Xcomp
2379 } else if (match_option(option, "-Xcomp", &tail)) {
2380 // for testing the compiler; turn off all flags that inhibit compilation
2381 set_mode_flags(_comp);
2382
2383 // -Xshare:dump
2384 } else if (match_option(option, "-Xshare:dump", &tail)) {
2385 #ifdef TIERED
2386 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2387 set_mode_flags(_int); // Prevent compilation, which creates objects
2388 #elif defined(COMPILER2)
2389 vm_exit_during_initialization(
2390 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2391 #elif defined(KERNEL)
2392 vm_exit_during_initialization(
2393 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2394 #else
2395 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2396 set_mode_flags(_int); // Prevent compilation, which creates objects
2397 #endif
2398 // -Xshare:on
2399 } else if (match_option(option, "-Xshare:on", &tail)) {
2400 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2401 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2402 #ifdef TIERED
2403 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2404 #endif // TIERED
2405 // -Xshare:auto
2406 } else if (match_option(option, "-Xshare:auto", &tail)) {
2407 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2408 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2409 // -Xshare:off
2410 } else if (match_option(option, "-Xshare:off", &tail)) {
2411 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2412 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2413
2414 // -Xverify
2415 } else if (match_option(option, "-Xverify", &tail)) {
2416 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2417 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2418 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2419 } else if (strcmp(tail, ":remote") == 0) {
2420 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2421 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2422 } else if (strcmp(tail, ":none") == 0) {
2423 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2424 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2425 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2426 return JNI_EINVAL;
2427 }
2428 // -Xdebug
2429 } else if (match_option(option, "-Xdebug", &tail)) {
2430 // note this flag has been used, then ignore
2431 set_xdebug_mode(true);
2432 // -Xnoagent
2433 } else if (match_option(option, "-Xnoagent", &tail)) {
2434 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2435 } else if (match_option(option, "-Xboundthreads", &tail)) {
2436 // Bind user level threads to kernel threads (Solaris only)
2437 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2438 } else if (match_option(option, "-Xloggc:", &tail)) {
2439 // Redirect GC output to the file. -Xloggc:<filename>
2440 // ostream_init_log(), when called will use this filename
2441 // to initialize a fileStream.
2442 _gc_log_filename = strdup(tail);
2443 FLAG_SET_CMDLINE(bool, PrintGC, true);
2444 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2445 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2446
2447 // JNI hooks
2448 } else if (match_option(option, "-Xcheck", &tail)) {
2449 if (!strcmp(tail, ":jni")) {
2450 CheckJNICalls = true;
2451 } else if (is_bad_option(option, args->ignoreUnrecognized,
2452 "check")) {
2453 return JNI_EINVAL;
2454 }
2455 } else if (match_option(option, "vfprintf", &tail)) {
2456 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2457 } else if (match_option(option, "exit", &tail)) {
2458 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2459 } else if (match_option(option, "abort", &tail)) {
2460 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2461 // -XX:+AggressiveHeap
2462 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2463
2464 // This option inspects the machine and attempts to set various
2465 // parameters to be optimal for long-running, memory allocation
2466 // intensive jobs. It is intended for machines with large
2467 // amounts of cpu and memory.
2468
2469 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2470 // VM, but we may not be able to represent the total physical memory
2471 // available (like having 8gb of memory on a box but using a 32bit VM).
2472 // Thus, we need to make sure we're using a julong for intermediate
2473 // calculations.
2474 julong initHeapSize;
2475 julong total_memory = os::physical_memory();
2476
2477 if (total_memory < (julong)256*M) {
2478 jio_fprintf(defaultStream::error_stream(),
2479 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2480 vm_exit(1);
2481 }
2482
2483 // The heap size is half of available memory, or (at most)
2484 // all of possible memory less 160mb (leaving room for the OS
2485 // when using ISM). This is the maximum; because adaptive sizing
2486 // is turned on below, the actual space used may be smaller.
2487
2488 initHeapSize = MIN2(total_memory / (julong)2,
2489 total_memory - (julong)160*M);
2490
2491 // Make sure that if we have a lot of memory we cap the 32 bit
2492 // process space. The 64bit VM version of this function is a nop.
2493 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2494
2495 // The perm gen is separate but contiguous with the
2496 // object heap (and is reserved with it) so subtract it
2497 // from the heap size.
2498 if (initHeapSize > MaxPermSize) {
2499 initHeapSize = initHeapSize - MaxPermSize;
2500 } else {
2501 warning("AggressiveHeap and MaxPermSize values may conflict");
2502 }
2503
2504 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2505 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2506 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2507 // Currently the minimum size and the initial heap sizes are the same.
2508 set_min_heap_size(initHeapSize);
2509 }
2510 if (FLAG_IS_DEFAULT(NewSize)) {
2511 // Make the young generation 3/8ths of the total heap.
2512 FLAG_SET_CMDLINE(uintx, NewSize,
2513 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2514 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2515 }
2516
2517 FLAG_SET_DEFAULT(UseLargePages, true);
2518
2519 // Increase some data structure sizes for efficiency
2520 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2521 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2522 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2523
2524 // See the OldPLABSize comment below, but replace 'after promotion'
2525 // with 'after copying'. YoungPLABSize is the size of the survivor
2526 // space per-gc-thread buffers. The default is 4kw.
2527 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2528
2529 // OldPLABSize is the size of the buffers in the old gen that
2530 // UseParallelGC uses to promote live data that doesn't fit in the
2531 // survivor spaces. At any given time, there's one for each gc thread.
2532 // The default size is 1kw. These buffers are rarely used, since the
2533 // survivor spaces are usually big enough. For specjbb, however, there
2534 // are occasions when there's lots of live data in the young gen
2535 // and we end up promoting some of it. We don't have a definite
2536 // explanation for why bumping OldPLABSize helps, but the theory
2537 // is that a bigger PLAB results in retaining something like the
2538 // original allocation order after promotion, which improves mutator
2539 // locality. A minor effect may be that larger PLABs reduce the
2540 // number of PLAB allocation events during gc. The value of 8kw
2541 // was arrived at by experimenting with specjbb.
2542 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2543
2544 // CompilationPolicyChoice=0 causes the server compiler to adopt
2545 // a more conservative which-method-do-I-compile policy when one
2546 // of the counters maintained by the interpreter trips. The
2547 // result is reduced startup time and improved specjbb and
2548 // alacrity performance. Zero is the default, but we set it
2549 // explicitly here in case the default changes.
2550 // See runtime/compilationPolicy.*.
2551 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2552
2553 // Enable parallel GC and adaptive generation sizing
2554 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2555 FLAG_SET_DEFAULT(ParallelGCThreads,
2556 Abstract_VM_Version::parallel_worker_threads());
2557
2558 // Encourage steady state memory management
2559 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2560
2561 // This appears to improve mutator locality
2562 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2563
2564 // Get around early Solaris scheduling bug
2565 // (affinity vs other jobs on system)
2566 // but disallow DR and offlining (5008695).
2567 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2568
2569 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2570 // The last option must always win.
2571 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2572 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2573 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2574 // The last option must always win.
2575 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2576 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2577 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2578 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2579 jio_fprintf(defaultStream::error_stream(),
2580 "Please use CMSClassUnloadingEnabled in place of "
2581 "CMSPermGenSweepingEnabled in the future\n");
2582 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2583 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2584 jio_fprintf(defaultStream::error_stream(),
2585 "Please use -XX:+UseGCOverheadLimit in place of "
2586 "-XX:+UseGCTimeLimit in the future\n");
2587 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2588 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2589 jio_fprintf(defaultStream::error_stream(),
2590 "Please use -XX:-UseGCOverheadLimit in place of "
2591 "-XX:-UseGCTimeLimit in the future\n");
2592 // The TLE options are for compatibility with 1.3 and will be
2593 // removed without notice in a future release. These options
2594 // are not to be documented.
2595 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2596 // No longer used.
2597 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2598 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2599 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2600 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2601 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2602 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2603 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2604 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2605 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2606 // No longer used.
2607 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2608 julong long_tlab_size = 0;
2609 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2610 if (errcode != arg_in_range) {
2611 jio_fprintf(defaultStream::error_stream(),
2612 "Invalid TLAB size: %s\n", option->optionString);
2613 describe_range_error(errcode);
2614 return JNI_EINVAL;
2615 }
2616 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2617 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2618 // No longer used.
2619 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2620 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2621 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2622 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2623 SOLARIS_ONLY(
2624 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2625 warning("-XX:+UsePermISM is obsolete.");
2626 FLAG_SET_CMDLINE(bool, UseISM, true);
2627 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2628 FLAG_SET_CMDLINE(bool, UseISM, false);
2629 )
2630 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2631 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2632 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2633 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2634 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2635 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2636 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2637 #ifdef SOLARIS
2638 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2639 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2640 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2641 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2642 #else // ndef SOLARIS
2643 jio_fprintf(defaultStream::error_stream(),
2644 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2645 return JNI_EINVAL;
2646 #endif // ndef SOLARIS
2647 #ifdef ASSERT
2648 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2649 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2650 // disable scavenge before parallel mark-compact
2651 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2652 #endif
2653 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2654 julong cms_blocks_to_claim = (julong)atol(tail);
2655 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2656 jio_fprintf(defaultStream::error_stream(),
2657 "Please use -XX:OldPLABSize in place of "
2658 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2659 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2660 julong cms_blocks_to_claim = (julong)atol(tail);
2661 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2662 jio_fprintf(defaultStream::error_stream(),
2663 "Please use -XX:OldPLABSize in place of "
2664 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2665 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2666 julong old_plab_size = 0;
2667 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2668 if (errcode != arg_in_range) {
2669 jio_fprintf(defaultStream::error_stream(),
2670 "Invalid old PLAB size: %s\n", option->optionString);
2671 describe_range_error(errcode);
2672 return JNI_EINVAL;
2673 }
2674 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2675 jio_fprintf(defaultStream::error_stream(),
2676 "Please use -XX:OldPLABSize in place of "
2677 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2678 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2679 julong young_plab_size = 0;
2680 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2681 if (errcode != arg_in_range) {
2682 jio_fprintf(defaultStream::error_stream(),
2683 "Invalid young PLAB size: %s\n", option->optionString);
2684 describe_range_error(errcode);
2685 return JNI_EINVAL;
2686 }
2687 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2688 jio_fprintf(defaultStream::error_stream(),
2689 "Please use -XX:YoungPLABSize in place of "
2690 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2691 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2692 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2693 julong stack_size = 0;
2694 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2695 if (errcode != arg_in_range) {
2696 jio_fprintf(defaultStream::error_stream(),
2697 "Invalid mark stack size: %s\n", option->optionString);
2698 describe_range_error(errcode);
2699 return JNI_EINVAL;
2700 }
2701 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2702 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2703 julong max_stack_size = 0;
2704 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2705 if (errcode != arg_in_range) {
2706 jio_fprintf(defaultStream::error_stream(),
2707 "Invalid maximum mark stack size: %s\n",
2708 option->optionString);
2709 describe_range_error(errcode);
2710 return JNI_EINVAL;
2711 }
2712 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2713 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2714 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2715 uintx conc_threads = 0;
2716 if (!parse_uintx(tail, &conc_threads, 1)) {
2717 jio_fprintf(defaultStream::error_stream(),
2718 "Invalid concurrent threads: %s\n", option->optionString);
2719 return JNI_EINVAL;
2720 }
2721 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2722 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2723 // Skip -XX:Flags= since that case has already been handled
2724 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2725 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2726 return JNI_EINVAL;
2727 }
2728 }
2729 // Unknown option
2730 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2731 return JNI_ERR;
2732 }
2733 }
2734 // Change the default value for flags which have different default values
2735 // when working with older JDKs.
2736 if (JDK_Version::current().compare_major(6) <= 0 &&
2737 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2738 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2739 }
2740 #ifdef LINUX
2741 if (JDK_Version::current().compare_major(6) <= 0 &&
2742 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2743 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2744 }
2745 #endif // LINUX
2746 return JNI_OK;
2747 }
2748
2749 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2750 // This must be done after all -D arguments have been processed.
2751 scp_p->expand_endorsed();
2752
2753 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2754 // Assemble the bootclasspath elements into the final path.
2755 Arguments::set_sysclasspath(scp_p->combined_path());
2756 }
2757
2758 // This must be done after all arguments have been processed.
2759 // java_compiler() true means set to "NONE" or empty.
2760 if (java_compiler() && !xdebug_mode()) {
2761 // For backwards compatibility, we switch to interpreted mode if
2762 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2763 // not specified.
2764 set_mode_flags(_int);
2765 }
2766 if (CompileThreshold == 0) {
2767 set_mode_flags(_int);
2768 }
2769
2770 #ifndef COMPILER2
2771 // Don't degrade server performance for footprint
2772 if (FLAG_IS_DEFAULT(UseLargePages) &&
2773 MaxHeapSize < LargePageHeapSizeThreshold) {
2774 // No need for large granularity pages w/small heaps.
2775 // Note that large pages are enabled/disabled for both the
2776 // Java heap and the code cache.
2777 FLAG_SET_DEFAULT(UseLargePages, false);
2778 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2779 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2780 }
2781
2782 // Tiered compilation is undefined with C1.
2783 TieredCompilation = false;
2784 #else
2785 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2786 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2787 }
2788 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2789 if (UseG1GC) {
2790 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2791 }
2792 #endif
2793
2794 // If we are running in a headless jre, force java.awt.headless property
2795 // to be true unless the property has already been set.
2796 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2797 if (os::is_headless_jre()) {
2798 const char* headless = Arguments::get_property("java.awt.headless");
2799 if (headless == NULL) {
2800 char envbuffer[128];
2801 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2802 if (!add_property("java.awt.headless=true")) {
2803 return JNI_ENOMEM;
2804 }
2805 } else {
2806 char buffer[256];
2807 strcpy(buffer, "java.awt.headless=");
2808 strcat(buffer, envbuffer);
2809 if (!add_property(buffer)) {
2810 return JNI_ENOMEM;
2811 }
2812 }
2813 }
2814 }
2815
2816 if (!check_vm_args_consistency()) {
2817 return JNI_ERR;
2818 }
2819
2820 return JNI_OK;
2821 }
2822
2823 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2824 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2825 scp_assembly_required_p);
2826 }
2827
2828 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2829 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2830 scp_assembly_required_p);
2831 }
2832
2833 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2834 const int N_MAX_OPTIONS = 64;
2835 const int OPTION_BUFFER_SIZE = 1024;
2836 char buffer[OPTION_BUFFER_SIZE];
2837
2838 // The variable will be ignored if it exceeds the length of the buffer.
2839 // Don't check this variable if user has special privileges
2840 // (e.g. unix su command).
2841 if (os::getenv(name, buffer, sizeof(buffer)) &&
2842 !os::have_special_privileges()) {
2843 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2844 jio_fprintf(defaultStream::error_stream(),
2845 "Picked up %s: %s\n", name, buffer);
2846 char* rd = buffer; // pointer to the input string (rd)
2847 int i;
2848 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2849 while (isspace(*rd)) rd++; // skip whitespace
2850 if (*rd == 0) break; // we re done when the input string is read completely
2851
2852 // The output, option string, overwrites the input string.
2853 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2854 // input string (rd).
2855 char* wrt = rd;
2856
2857 options[i++].optionString = wrt; // Fill in option
2858 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2859 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2860 int quote = *rd; // matching quote to look for
2861 rd++; // don't copy open quote
2862 while (*rd != quote) { // include everything (even spaces) up until quote
2863 if (*rd == 0) { // string termination means unmatched string
2864 jio_fprintf(defaultStream::error_stream(),
2865 "Unmatched quote in %s\n", name);
2866 return JNI_ERR;
2867 }
2868 *wrt++ = *rd++; // copy to option string
2869 }
2870 rd++; // don't copy close quote
2871 } else {
2872 *wrt++ = *rd++; // copy to option string
2873 }
2874 }
2875 // Need to check if we're done before writing a NULL,
2876 // because the write could be to the byte that rd is pointing to.
2877 if (*rd++ == 0) {
2878 *wrt = 0;
2879 break;
2880 }
2881 *wrt = 0; // Zero terminate option
2882 }
2883 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2884 JavaVMInitArgs vm_args;
2885 vm_args.version = JNI_VERSION_1_2;
2886 vm_args.options = options;
2887 vm_args.nOptions = i;
2888 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2889
2890 if (PrintVMOptions) {
2891 const char* tail;
2892 for (int i = 0; i < vm_args.nOptions; i++) {
2893 const JavaVMOption *option = vm_args.options + i;
2894 if (match_option(option, "-XX:", &tail)) {
2895 logOption(tail);
2896 }
2897 }
2898 }
2899
2900 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2901 }
2902 return JNI_OK;
2903 }
2904
2905
2906 // Parse entry point called from JNI_CreateJavaVM
2907
2908 jint Arguments::parse(const JavaVMInitArgs* args) {
2909
2910 // Sharing support
2911 // Construct the path to the archive
2912 char jvm_path[JVM_MAXPATHLEN];
2913 os::jvm_path(jvm_path, sizeof(jvm_path));
2914 #ifdef TIERED
2915 if (strstr(jvm_path, "client") != NULL) {
2916 force_client_mode = true;
2917 }
2918 #endif // TIERED
2919 char *end = strrchr(jvm_path, *os::file_separator());
2920 if (end != NULL) *end = '\0';
2921 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2922 strlen(os::file_separator()) + 20);
2923 if (shared_archive_path == NULL) return JNI_ENOMEM;
2924 strcpy(shared_archive_path, jvm_path);
2925 strcat(shared_archive_path, os::file_separator());
2926 strcat(shared_archive_path, "classes");
2927 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2928 strcat(shared_archive_path, ".jsa");
2929 SharedArchivePath = shared_archive_path;
2930
2931 // Remaining part of option string
2932 const char* tail;
2933
2934 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2935 bool settings_file_specified = false;
2936 const char* flags_file;
2937 int index;
2938 for (index = 0; index < args->nOptions; index++) {
2939 const JavaVMOption *option = args->options + index;
2940 if (match_option(option, "-XX:Flags=", &tail)) {
2941 flags_file = tail;
2942 settings_file_specified = true;
2943 }
2944 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2945 PrintVMOptions = true;
2946 }
2947 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2948 PrintVMOptions = false;
2949 }
2950 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2951 IgnoreUnrecognizedVMOptions = true;
2952 }
2953 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2954 IgnoreUnrecognizedVMOptions = false;
2955 }
2956 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2957 CommandLineFlags::printFlags();
2958 vm_exit(0);
2959 }
2960
2961 #ifndef PRODUCT
2962 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2963 CommandLineFlags::printFlags(true);
2964 vm_exit(0);
2965 }
2966 #endif
2967 }
2968
2969 if (IgnoreUnrecognizedVMOptions) {
2970 // uncast const to modify the flag args->ignoreUnrecognized
2971 *(jboolean*)(&args->ignoreUnrecognized) = true;
2972 }
2973
2974 // Parse specified settings file
2975 if (settings_file_specified) {
2976 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2977 return JNI_EINVAL;
2978 }
2979 }
2980
2981 // Parse default .hotspotrc settings file
2982 if (!settings_file_specified) {
2983 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2984 return JNI_EINVAL;
2985 }
2986 }
2987
2988 if (PrintVMOptions) {
2989 for (index = 0; index < args->nOptions; index++) {
2990 const JavaVMOption *option = args->options + index;
2991 if (match_option(option, "-XX:", &tail)) {
2992 logOption(tail);
2993 }
2994 }
2995 }
2996
2997 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2998 jint result = parse_vm_init_args(args);
2999 if (result != JNI_OK) {
3000 return result;
3001 }
3002
3003 #ifndef PRODUCT
3004 if (TraceBytecodesAt != 0) {
3005 TraceBytecodes = true;
3006 }
3007 if (CountCompiledCalls) {
3008 if (UseCounterDecay) {
3009 warning("UseCounterDecay disabled because CountCalls is set");
3010 UseCounterDecay = false;
3011 }
3012 }
3013 #endif // PRODUCT
3014
3015 if (EnableInvokeDynamic && !EnableMethodHandles) {
3016 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
3017 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
3018 }
3019 EnableMethodHandles = true;
3020 }
3021 if (EnableMethodHandles && !AnonymousClasses) {
3022 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
3023 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
3024 }
3025 AnonymousClasses = true;
3026 }
3027 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
3028 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3029 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
3030 }
3031 ScavengeRootsInCode = 1;
3032 }
3033 #ifdef COMPILER2
3034 if (EnableInvokeDynamic && DoEscapeAnalysis) {
3035 // TODO: We need to find rules for invokedynamic and EA. For now,
3036 // simply disable EA by default.
3037 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
3038 DoEscapeAnalysis = false;
3039 }
3040 }
3041 #endif
3042
3043 if (PrintGCDetails) {
3044 // Turn on -verbose:gc options as well
3045 PrintGC = true;
3046 }
3047
3048 // Set object alignment values.
3049 set_object_alignment();
3050
3051 #ifdef SERIALGC
3052 force_serial_gc();
3053 #endif // SERIALGC
3054 #ifdef KERNEL
3055 no_shared_spaces();
3056 #endif // KERNEL
3057
3058 // Set flags based on ergonomics.
3059 set_ergonomics_flags();
3060
3061 if (UseCompressedOops) {
3062 check_compressed_oops_compat();
3063 }
3064
3065 // Check the GC selections again.
3066 if (!check_gc_consistency()) {
3067 return JNI_EINVAL;
3068 }
3069
3070 if (TieredCompilation) {
3071 set_tiered_flags();
3072 } else {
3073 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3074 if (CompilationPolicyChoice >= 2) {
3075 vm_exit_during_initialization(
3076 "Incompatible compilation policy selected", NULL);
3077 }
3078 }
3079
3080 #ifndef KERNEL
3081 if (UseConcMarkSweepGC) {
3082 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
3083 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
3084 // are true, we don't call set_parnew_gc_flags() as well.
3085 set_cms_and_parnew_gc_flags();
3086 } else {
3087 // Set heap size based on available physical memory
3088 set_heap_size();
3089 // Set per-collector flags
3090 if (UseParallelGC || UseParallelOldGC) {
3091 set_parallel_gc_flags();
3092 } else if (UseParNewGC) {
3093 set_parnew_gc_flags();
3094 } else if (UseG1GC) {
3095 set_g1_gc_flags();
3096 }
3097 }
3098 #endif // KERNEL
3099
3100 #ifdef SERIALGC
3101 assert(verify_serial_gc_flags(), "SerialGC unset");
3102 #endif // SERIALGC
3103
3104 // Set bytecode rewriting flags
3105 set_bytecode_flags();
3106
3107 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3108 set_aggressive_opts_flags();
3109
3110 #ifdef CC_INTERP
3111 // Clear flags not supported by the C++ interpreter
3112 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3113 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3114 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3115 #endif // CC_INTERP
3116
3117 #ifdef COMPILER2
3118 if (!UseBiasedLocking || EmitSync != 0) {
3119 UseOptoBiasInlining = false;
3120 }
3121 #endif
3122
3123 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3124 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3125 DebugNonSafepoints = true;
3126 }
3127
3128 #ifndef PRODUCT
3129 if (CompileTheWorld) {
3130 // Force NmethodSweeper to sweep whole CodeCache each time.
3131 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3132 NmethodSweepFraction = 1;
3133 }
3134 }
3135 #endif
3136
3137 if (PrintCommandLineFlags) {
3138 CommandLineFlags::printSetFlags();
3139 }
3140
3141 // Apply CPU specific policy for the BiasedLocking
3142 if (UseBiasedLocking) {
3143 if (!VM_Version::use_biased_locking() &&
3144 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3145 UseBiasedLocking = false;
3146 }
3147 }
3148
3149 return JNI_OK;
3150 }
3151
3152 int Arguments::PropertyList_count(SystemProperty* pl) {
3153 int count = 0;
3154 while(pl != NULL) {
3155 count++;
3156 pl = pl->next();
3157 }
3158 return count;
3159 }
3160
3161 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3162 assert(key != NULL, "just checking");
3163 SystemProperty* prop;
3164 for (prop = pl; prop != NULL; prop = prop->next()) {
3165 if (strcmp(key, prop->key()) == 0) return prop->value();
3166 }
3167 return NULL;
3168 }
3169
3170 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3171 int count = 0;
3172 const char* ret_val = NULL;
3173
3174 while(pl != NULL) {
3175 if(count >= index) {
3176 ret_val = pl->key();
3177 break;
3178 }
3179 count++;
3180 pl = pl->next();
3181 }
3182
3183 return ret_val;
3184 }
3185
3186 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3187 int count = 0;
3188 char* ret_val = NULL;
3189
3190 while(pl != NULL) {
3191 if(count >= index) {
3192 ret_val = pl->value();
3193 break;
3194 }
3195 count++;
3196 pl = pl->next();
3197 }
3198
3199 return ret_val;
3200 }
3201
3202 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3203 SystemProperty* p = *plist;
3204 if (p == NULL) {
3205 *plist = new_p;
3206 } else {
3207 while (p->next() != NULL) {
3208 p = p->next();
3209 }
3210 p->set_next(new_p);
3211 }
3212 }
3213
3214 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3215 if (plist == NULL)
3216 return;
3217
3218 SystemProperty* new_p = new SystemProperty(k, v, true);
3219 PropertyList_add(plist, new_p);
3220 }
3221
3222 // This add maintains unique property key in the list.
3223 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3224 if (plist == NULL)
3225 return;
3226
3227 // If property key exist then update with new value.
3228 SystemProperty* prop;
3229 for (prop = *plist; prop != NULL; prop = prop->next()) {
3230 if (strcmp(k, prop->key()) == 0) {
3231 if (append) {
3232 prop->append_value(v);
3233 } else {
3234 prop->set_value(v);
3235 }
3236 return;
3237 }
3238 }
3239
3240 PropertyList_add(plist, k, v);
3241 }
3242
3243 #ifdef KERNEL
3244 char *Arguments::get_kernel_properties() {
3245 // Find properties starting with kernel and append them to string
3246 // We need to find out how long they are first because the URL's that they
3247 // might point to could get long.
3248 int length = 0;
3249 SystemProperty* prop;
3250 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3251 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3252 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3253 }
3254 }
3255 // Add one for null terminator.
3256 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3257 if (length != 0) {
3258 int pos = 0;
3259 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3260 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3261 jio_snprintf(&props[pos], length-pos,
3262 "-D%s=%s ", prop->key(), prop->value());
3263 pos = strlen(props);
3264 }
3265 }
3266 }
3267 // null terminate props in case of null
3268 props[length] = '\0';
3269 return props;
3270 }
3271 #endif // KERNEL
3272
3273 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3274 // Returns true if all of the source pointed by src has been copied over to
3275 // the destination buffer pointed by buf. Otherwise, returns false.
3276 // Notes:
3277 // 1. If the length (buflen) of the destination buffer excluding the
3278 // NULL terminator character is not long enough for holding the expanded
3279 // pid characters, it also returns false instead of returning the partially
3280 // expanded one.
3281 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3282 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3283 char* buf, size_t buflen) {
3284 const char* p = src;
3285 char* b = buf;
3286 const char* src_end = &src[srclen];
3287 char* buf_end = &buf[buflen - 1];
3288
3289 while (p < src_end && b < buf_end) {
3290 if (*p == '%') {
3291 switch (*(++p)) {
3292 case '%': // "%%" ==> "%"
3293 *b++ = *p++;
3294 break;
3295 case 'p': { // "%p" ==> current process id
3296 // buf_end points to the character before the last character so
3297 // that we could write '\0' to the end of the buffer.
3298 size_t buf_sz = buf_end - b + 1;
3299 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3300
3301 // if jio_snprintf fails or the buffer is not long enough to hold
3302 // the expanded pid, returns false.
3303 if (ret < 0 || ret >= (int)buf_sz) {
3304 return false;
3305 } else {
3306 b += ret;
3307 assert(*b == '\0', "fail in copy_expand_pid");
3308 if (p == src_end && b == buf_end + 1) {
3309 // reach the end of the buffer.
3310 return true;
3311 }
3312 }
3313 p++;
3314 break;
3315 }
3316 default :
3317 *b++ = '%';
3318 }
3319 } else {
3320 *b++ = *p++;
3321 }
3322 }
3323 *b = '\0';
3324 return (p == src_end); // return false if not all of the source was copied
3325 }