1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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 bool Arguments::_created_by_gamma_launcher = false;
82
83 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
84 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
85 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
86 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
87 bool Arguments::_ClipInlining = ClipInlining;
88
89 char* Arguments::SharedArchivePath = NULL;
90
91 AgentLibraryList Arguments::_libraryList;
92 AgentLibraryList Arguments::_agentList;
93
94 abort_hook_t Arguments::_abort_hook = NULL;
95 exit_hook_t Arguments::_exit_hook = NULL;
96 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
97
98
99 SystemProperty *Arguments::_java_ext_dirs = NULL;
100 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
101 SystemProperty *Arguments::_sun_boot_library_path = NULL;
102 SystemProperty *Arguments::_java_library_path = NULL;
103 SystemProperty *Arguments::_java_home = NULL;
104 SystemProperty *Arguments::_java_class_path = NULL;
105 SystemProperty *Arguments::_sun_boot_class_path = NULL;
106
107 char* Arguments::_meta_index_path = NULL;
108 char* Arguments::_meta_index_dir = NULL;
109
110 static bool force_client_mode = false;
111
112 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
113
114 static bool match_option(const JavaVMOption *option, const char* name,
115 const char** tail) {
116 int len = (int)strlen(name);
117 if (strncmp(option->optionString, name, len) == 0) {
118 *tail = option->optionString + len;
119 return true;
120 } else {
121 return false;
122 }
123 }
124
125 static void logOption(const char* opt) {
126 if (PrintVMOptions) {
127 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
128 }
129 }
130
131 // Process java launcher properties.
132 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
133 // See if sun.java.launcher or sun.java.launcher.pid is defined.
134 // Must do this before setting up other system properties,
135 // as some of them may depend on launcher type.
136 for (int index = 0; index < args->nOptions; index++) {
137 const JavaVMOption* option = args->options + index;
138 const char* tail;
139
140 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
141 process_java_launcher_argument(tail, option->extraInfo);
142 continue;
143 }
144 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
145 _sun_java_launcher_pid = atoi(tail);
146 continue;
147 }
148 }
149 }
150
151 // Initialize system properties key and value.
152 void Arguments::init_system_properties() {
153
154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
155 "Java Virtual Machine Specification", false));
156 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
157 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
158 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
159
160 // following are JVMTI agent writeable properties.
161 // Properties values are set to NULL and they are
162 // os specific they are initialized in os::init_system_properties_values().
163 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
164 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
165 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
166 _java_library_path = new SystemProperty("java.library.path", NULL, true);
167 _java_home = new SystemProperty("java.home", NULL, true);
168 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
169
170 _java_class_path = new SystemProperty("java.class.path", "", true);
171
172 // Add to System Property list.
173 PropertyList_add(&_system_properties, _java_ext_dirs);
174 PropertyList_add(&_system_properties, _java_endorsed_dirs);
175 PropertyList_add(&_system_properties, _sun_boot_library_path);
176 PropertyList_add(&_system_properties, _java_library_path);
177 PropertyList_add(&_system_properties, _java_home);
178 PropertyList_add(&_system_properties, _java_class_path);
179 PropertyList_add(&_system_properties, _sun_boot_class_path);
180
181 // Set OS specific system properties values
182 os::init_system_properties_values();
183 }
184
185
186 // Update/Initialize System properties after JDK version number is known
187 void Arguments::init_version_specific_system_properties() {
188 enum { bufsz = 16 };
189 char buffer[bufsz];
190 const char* spec_vendor = "Sun Microsystems Inc.";
191 uint32_t spec_version = 0;
192
193 if (JDK_Version::is_gte_jdk17x_version()) {
194 spec_vendor = "Oracle Corporation";
195 spec_version = JDK_Version::current().major_version();
196 }
197 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
198
199 PropertyList_add(&_system_properties,
200 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
201 PropertyList_add(&_system_properties,
202 new SystemProperty("java.vm.specification.version", buffer, false));
203 PropertyList_add(&_system_properties,
204 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
205 }
206
207 /**
208 * Provide a slightly more user-friendly way of eliminating -XX flags.
209 * When a flag is eliminated, it can be added to this list in order to
210 * continue accepting this flag on the command-line, while issuing a warning
211 * and ignoring the value. Once the JDK version reaches the 'accept_until'
212 * limit, we flatly refuse to admit the existence of the flag. This allows
213 * a flag to die correctly over JDK releases using HSX.
214 */
215 typedef struct {
216 const char* name;
217 JDK_Version obsoleted_in; // when the flag went away
218 JDK_Version accept_until; // which version to start denying the existence
219 } ObsoleteFlag;
220
221 static ObsoleteFlag obsolete_jvm_flags[] = {
222 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
232 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
233 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
234 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
235 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
236 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
237 { "DefaultInitialRAMFraction",
238 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
239 { "UseDepthFirstScavengeOrder",
240 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
241 { "HandlePromotionFailure",
242 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
243 { "MaxLiveObjectEvacuationRatio",
244 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
245 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
246 { NULL, JDK_Version(0), JDK_Version(0) }
247 };
248
249 // Returns true if the flag is obsolete and fits into the range specified
250 // for being ignored. In the case that the flag is ignored, the 'version'
251 // value is filled in with the version number when the flag became
252 // obsolete so that that value can be displayed to the user.
253 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
254 int i = 0;
255 assert(version != NULL, "Must provide a version buffer");
256 while (obsolete_jvm_flags[i].name != NULL) {
257 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
258 // <flag>=xxx form
259 // [-|+]<flag> form
260 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
261 ((s[0] == '+' || s[0] == '-') &&
262 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
263 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
264 *version = flag_status.obsoleted_in;
265 return true;
266 }
267 }
268 i++;
269 }
270 return false;
271 }
272
273 // Constructs the system class path (aka boot class path) from the following
274 // components, in order:
275 //
276 // prefix // from -Xbootclasspath/p:...
277 // endorsed // the expansion of -Djava.endorsed.dirs=...
278 // base // from os::get_system_properties() or -Xbootclasspath=
279 // suffix // from -Xbootclasspath/a:...
280 //
281 // java.endorsed.dirs is a list of directories; any jar or zip files in the
282 // directories are added to the sysclasspath just before the base.
283 //
284 // This could be AllStatic, but it isn't needed after argument processing is
285 // complete.
286 class SysClassPath: public StackObj {
287 public:
288 SysClassPath(const char* base);
289 ~SysClassPath();
290
291 inline void set_base(const char* base);
292 inline void add_prefix(const char* prefix);
293 inline void add_suffix_to_prefix(const char* suffix);
294 inline void add_suffix(const char* suffix);
295 inline void reset_path(const char* base);
296
297 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
298 // property. Must be called after all command-line arguments have been
299 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
300 // combined_path().
301 void expand_endorsed();
302
303 inline const char* get_base() const { return _items[_scp_base]; }
304 inline const char* get_prefix() const { return _items[_scp_prefix]; }
305 inline const char* get_suffix() const { return _items[_scp_suffix]; }
306 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
307
308 // Combine all the components into a single c-heap-allocated string; caller
309 // must free the string if/when no longer needed.
310 char* combined_path();
311
312 private:
313 // Utility routines.
314 static char* add_to_path(const char* path, const char* str, bool prepend);
315 static char* add_jars_to_path(char* path, const char* directory);
316
317 inline void reset_item_at(int index);
318
319 // Array indices for the items that make up the sysclasspath. All except the
320 // base are allocated in the C heap and freed by this class.
321 enum {
322 _scp_prefix, // from -Xbootclasspath/p:...
323 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
324 _scp_base, // the default sysclasspath
325 _scp_suffix, // from -Xbootclasspath/a:...
326 _scp_nitems // the number of items, must be last.
327 };
328
329 const char* _items[_scp_nitems];
330 DEBUG_ONLY(bool _expansion_done;)
331 };
332
333 SysClassPath::SysClassPath(const char* base) {
334 memset(_items, 0, sizeof(_items));
335 _items[_scp_base] = base;
336 DEBUG_ONLY(_expansion_done = false;)
337 }
338
339 SysClassPath::~SysClassPath() {
340 // Free everything except the base.
341 for (int i = 0; i < _scp_nitems; ++i) {
342 if (i != _scp_base) reset_item_at(i);
343 }
344 DEBUG_ONLY(_expansion_done = false;)
345 }
346
347 inline void SysClassPath::set_base(const char* base) {
348 _items[_scp_base] = base;
349 }
350
351 inline void SysClassPath::add_prefix(const char* prefix) {
352 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
353 }
354
355 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
356 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
357 }
358
359 inline void SysClassPath::add_suffix(const char* suffix) {
360 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
361 }
362
363 inline void SysClassPath::reset_item_at(int index) {
364 assert(index < _scp_nitems && index != _scp_base, "just checking");
365 if (_items[index] != NULL) {
366 FREE_C_HEAP_ARRAY(char, _items[index]);
367 _items[index] = NULL;
368 }
369 }
370
371 inline void SysClassPath::reset_path(const char* base) {
372 // Clear the prefix and suffix.
373 reset_item_at(_scp_prefix);
374 reset_item_at(_scp_suffix);
375 set_base(base);
376 }
377
378 //------------------------------------------------------------------------------
379
380 void SysClassPath::expand_endorsed() {
381 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
382
383 const char* path = Arguments::get_property("java.endorsed.dirs");
384 if (path == NULL) {
385 path = Arguments::get_endorsed_dir();
386 assert(path != NULL, "no default for java.endorsed.dirs");
387 }
388
389 char* expanded_path = NULL;
390 const char separator = *os::path_separator();
391 const char* const end = path + strlen(path);
392 while (path < end) {
393 const char* tmp_end = strchr(path, separator);
394 if (tmp_end == NULL) {
395 expanded_path = add_jars_to_path(expanded_path, path);
396 path = end;
397 } else {
398 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
399 memcpy(dirpath, path, tmp_end - path);
400 dirpath[tmp_end - path] = '\0';
401 expanded_path = add_jars_to_path(expanded_path, dirpath);
402 FREE_C_HEAP_ARRAY(char, dirpath);
403 path = tmp_end + 1;
404 }
405 }
406 _items[_scp_endorsed] = expanded_path;
407 DEBUG_ONLY(_expansion_done = true;)
408 }
409
410 // Combine the bootclasspath elements, some of which may be null, into a single
411 // c-heap-allocated string.
412 char* SysClassPath::combined_path() {
413 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
414 assert(_expansion_done, "must call expand_endorsed() first.");
415
416 size_t lengths[_scp_nitems];
417 size_t total_len = 0;
418
419 const char separator = *os::path_separator();
420
421 // Get the lengths.
422 int i;
423 for (i = 0; i < _scp_nitems; ++i) {
424 if (_items[i] != NULL) {
425 lengths[i] = strlen(_items[i]);
426 // Include space for the separator char (or a NULL for the last item).
427 total_len += lengths[i] + 1;
428 }
429 }
430 assert(total_len > 0, "empty sysclasspath not allowed");
431
432 // Copy the _items to a single string.
433 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
434 char* cp_tmp = cp;
435 for (i = 0; i < _scp_nitems; ++i) {
436 if (_items[i] != NULL) {
437 memcpy(cp_tmp, _items[i], lengths[i]);
438 cp_tmp += lengths[i];
439 *cp_tmp++ = separator;
440 }
441 }
442 *--cp_tmp = '\0'; // Replace the extra separator.
443 return cp;
444 }
445
446 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
447 char*
448 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
449 char *cp;
450
451 assert(str != NULL, "just checking");
452 if (path == NULL) {
453 size_t len = strlen(str) + 1;
454 cp = NEW_C_HEAP_ARRAY(char, len);
455 memcpy(cp, str, len); // copy the trailing null
456 } else {
457 const char separator = *os::path_separator();
458 size_t old_len = strlen(path);
459 size_t str_len = strlen(str);
460 size_t len = old_len + str_len + 2;
461
462 if (prepend) {
463 cp = NEW_C_HEAP_ARRAY(char, len);
464 char* cp_tmp = cp;
465 memcpy(cp_tmp, str, str_len);
466 cp_tmp += str_len;
467 *cp_tmp = separator;
468 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
469 FREE_C_HEAP_ARRAY(char, path);
470 } else {
471 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
472 char* cp_tmp = cp + old_len;
473 *cp_tmp = separator;
474 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
475 }
476 }
477 return cp;
478 }
479
480 // Scan the directory and append any jar or zip files found to path.
481 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
482 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
483 DIR* dir = os::opendir(directory);
484 if (dir == NULL) return path;
485
486 char dir_sep[2] = { '\0', '\0' };
487 size_t directory_len = strlen(directory);
488 const char fileSep = *os::file_separator();
489 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
490
491 /* Scan the directory for jars/zips, appending them to path. */
492 struct dirent *entry;
493 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
494 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
495 const char* name = entry->d_name;
496 const char* ext = name + strlen(name) - 4;
497 bool isJarOrZip = ext > name &&
498 (os::file_name_strcmp(ext, ".jar") == 0 ||
499 os::file_name_strcmp(ext, ".zip") == 0);
500 if (isJarOrZip) {
501 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
502 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
503 path = add_to_path(path, jarpath, false);
504 FREE_C_HEAP_ARRAY(char, jarpath);
505 }
506 }
507 FREE_C_HEAP_ARRAY(char, dbuf);
508 os::closedir(dir);
509 return path;
510 }
511
512 // Parses a memory size specification string.
513 static bool atomull(const char *s, julong* result) {
514 julong n = 0;
515 int args_read = sscanf(s, os::julong_format_specifier(), &n);
516 if (args_read != 1) {
517 return false;
518 }
519 while (*s != '\0' && isdigit(*s)) {
520 s++;
521 }
522 // 4705540: illegal if more characters are found after the first non-digit
523 if (strlen(s) > 1) {
524 return false;
525 }
526 switch (*s) {
527 case 'T': case 't':
528 *result = n * G * K;
529 // Check for overflow.
530 if (*result/((julong)G * K) != n) return false;
531 return true;
532 case 'G': case 'g':
533 *result = n * G;
534 if (*result/G != n) return false;
535 return true;
536 case 'M': case 'm':
537 *result = n * M;
538 if (*result/M != n) return false;
539 return true;
540 case 'K': case 'k':
541 *result = n * K;
542 if (*result/K != n) return false;
543 return true;
544 case '\0':
545 *result = n;
546 return true;
547 default:
548 return false;
549 }
550 }
551
552 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
553 if (size < min_size) return arg_too_small;
554 // Check that size will fit in a size_t (only relevant on 32-bit)
555 if (size > max_uintx) return arg_too_big;
556 return arg_in_range;
557 }
558
559 // Describe an argument out of range error
560 void Arguments::describe_range_error(ArgsRange errcode) {
561 switch(errcode) {
562 case arg_too_big:
563 jio_fprintf(defaultStream::error_stream(),
564 "The specified size exceeds the maximum "
565 "representable size.\n");
566 break;
567 case arg_too_small:
568 case arg_unreadable:
569 case arg_in_range:
570 // do nothing for now
571 break;
572 default:
573 ShouldNotReachHere();
574 }
575 }
576
577 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
578 return CommandLineFlags::boolAtPut(name, &value, origin);
579 }
580
581 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
582 double v;
583 if (sscanf(value, "%lf", &v) != 1) {
584 return false;
585 }
586
587 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
588 return true;
589 }
590 return false;
591 }
592
593 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
594 julong v;
595 intx intx_v;
596 bool is_neg = false;
597 // Check the sign first since atomull() parses only unsigned values.
598 if (*value == '-') {
599 if (!CommandLineFlags::intxAt(name, &intx_v)) {
600 return false;
601 }
602 value++;
603 is_neg = true;
604 }
605 if (!atomull(value, &v)) {
606 return false;
607 }
608 intx_v = (intx) v;
609 if (is_neg) {
610 intx_v = -intx_v;
611 }
612 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
613 return true;
614 }
615 uintx uintx_v = (uintx) v;
616 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
617 return true;
618 }
619 uint64_t uint64_t_v = (uint64_t) v;
620 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
621 return true;
622 }
623 return false;
624 }
625
626 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
627 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
628 // Contract: CommandLineFlags always returns a pointer that needs freeing.
629 FREE_C_HEAP_ARRAY(char, value);
630 return true;
631 }
632
633 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
634 const char* old_value = "";
635 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
636 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
637 size_t new_len = strlen(new_value);
638 const char* value;
639 char* free_this_too = NULL;
640 if (old_len == 0) {
641 value = new_value;
642 } else if (new_len == 0) {
643 value = old_value;
644 } else {
645 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
646 // each new setting adds another LINE to the switch:
647 sprintf(buf, "%s\n%s", old_value, new_value);
648 value = buf;
649 free_this_too = buf;
650 }
651 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
652 // CommandLineFlags always returns a pointer that needs freeing.
653 FREE_C_HEAP_ARRAY(char, value);
654 if (free_this_too != NULL) {
655 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
656 FREE_C_HEAP_ARRAY(char, free_this_too);
657 }
658 return true;
659 }
660
661 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
662
663 // range of acceptable characters spelled out for portability reasons
664 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
665 #define BUFLEN 255
666 char name[BUFLEN+1];
667 char dummy;
668
669 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
670 return set_bool_flag(name, false, origin);
671 }
672 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
673 return set_bool_flag(name, true, origin);
674 }
675
676 char punct;
677 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
678 const char* value = strchr(arg, '=') + 1;
679 Flag* flag = Flag::find_flag(name, strlen(name));
680 if (flag != NULL && flag->is_ccstr()) {
681 if (flag->ccstr_accumulates()) {
682 return append_to_string_flag(name, value, origin);
683 } else {
684 if (value[0] == '\0') {
685 value = NULL;
686 }
687 return set_string_flag(name, value, origin);
688 }
689 }
690 }
691
692 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
693 const char* value = strchr(arg, '=') + 1;
694 // -XX:Foo:=xxx will reset the string flag to the given value.
695 if (value[0] == '\0') {
696 value = NULL;
697 }
698 return set_string_flag(name, value, origin);
699 }
700
701 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
702 #define SIGNED_NUMBER_RANGE "[-0123456789]"
703 #define NUMBER_RANGE "[0123456789]"
704 char value[BUFLEN + 1];
705 char value2[BUFLEN + 1];
706 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
707 // Looks like a floating-point number -- try again with more lenient format string
708 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
709 return set_fp_numeric_flag(name, value, origin);
710 }
711 }
712
713 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
715 return set_numeric_flag(name, value, origin);
716 }
717
718 return false;
719 }
720
721 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
722 assert(bldarray != NULL, "illegal argument");
723
724 if (arg == NULL) {
725 return;
726 }
727
728 int index = *count;
729
730 // expand the array and add arg to the last element
731 (*count)++;
732 if (*bldarray == NULL) {
733 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
734 } else {
735 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
736 }
737 (*bldarray)[index] = strdup(arg);
738 }
739
740 void Arguments::build_jvm_args(const char* arg) {
741 add_string(&_jvm_args_array, &_num_jvm_args, arg);
742 }
743
744 void Arguments::build_jvm_flags(const char* arg) {
745 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
746 }
747
748 // utility function to return a string that concatenates all
749 // strings in a given char** array
750 const char* Arguments::build_resource_string(char** args, int count) {
751 if (args == NULL || count == 0) {
752 return NULL;
753 }
754 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
755 for (int i = 1; i < count; i++) {
756 length += strlen(args[i]) + 1; // add 1 for a space
757 }
758 char* s = NEW_RESOURCE_ARRAY(char, length);
759 strcpy(s, args[0]);
760 for (int j = 1; j < count; j++) {
761 strcat(s, " ");
762 strcat(s, args[j]);
763 }
764 return (const char*) s;
765 }
766
767 void Arguments::print_on(outputStream* st) {
768 st->print_cr("VM Arguments:");
769 if (num_jvm_flags() > 0) {
770 st->print("jvm_flags: "); print_jvm_flags_on(st);
771 }
772 if (num_jvm_args() > 0) {
773 st->print("jvm_args: "); print_jvm_args_on(st);
774 }
775 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
776 st->print_cr("Launcher Type: %s", _sun_java_launcher);
777 }
778
779 void Arguments::print_jvm_flags_on(outputStream* st) {
780 if (_num_jvm_flags > 0) {
781 for (int i=0; i < _num_jvm_flags; i++) {
782 st->print("%s ", _jvm_flags_array[i]);
783 }
784 st->print_cr("");
785 }
786 }
787
788 void Arguments::print_jvm_args_on(outputStream* st) {
789 if (_num_jvm_args > 0) {
790 for (int i=0; i < _num_jvm_args; i++) {
791 st->print("%s ", _jvm_args_array[i]);
792 }
793 st->print_cr("");
794 }
795 }
796
797 bool Arguments::process_argument(const char* arg,
798 jboolean ignore_unrecognized, FlagValueOrigin origin) {
799
800 JDK_Version since = JDK_Version();
801
802 if (parse_argument(arg, origin)) {
803 // do nothing
804 } else if (is_newly_obsolete(arg, &since)) {
805 enum { bufsize = 256 };
806 char buffer[bufsize];
807 since.to_string(buffer, bufsize);
808 jio_fprintf(defaultStream::error_stream(),
809 "Warning: The flag %s has been EOL'd as of %s and will"
810 " be ignored\n", arg, buffer);
811 } else {
812 if (!ignore_unrecognized) {
813 jio_fprintf(defaultStream::error_stream(),
814 "Unrecognized VM option '%s'\n", arg);
815 // allow for commandline "commenting out" options like -XX:#+Verbose
816 if (strlen(arg) == 0 || arg[0] != '#') {
817 return false;
818 }
819 }
820 }
821 return true;
822 }
823
824 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
825 FILE* stream = fopen(file_name, "rb");
826 if (stream == NULL) {
827 if (should_exist) {
828 jio_fprintf(defaultStream::error_stream(),
829 "Could not open settings file %s\n", file_name);
830 return false;
831 } else {
832 return true;
833 }
834 }
835
836 char token[1024];
837 int pos = 0;
838
839 bool in_white_space = true;
840 bool in_comment = false;
841 bool in_quote = false;
842 char quote_c = 0;
843 bool result = true;
844
845 int c = getc(stream);
846 while(c != EOF) {
847 if (in_white_space) {
848 if (in_comment) {
849 if (c == '\n') in_comment = false;
850 } else {
851 if (c == '#') in_comment = true;
852 else if (!isspace(c)) {
853 in_white_space = false;
854 token[pos++] = c;
855 }
856 }
857 } else {
858 if (c == '\n' || (!in_quote && isspace(c))) {
859 // token ends at newline, or at unquoted whitespace
860 // this allows a way to include spaces in string-valued options
861 token[pos] = '\0';
862 logOption(token);
863 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
864 build_jvm_flags(token);
865 pos = 0;
866 in_white_space = true;
867 in_quote = false;
868 } else if (!in_quote && (c == '\'' || c == '"')) {
869 in_quote = true;
870 quote_c = c;
871 } else if (in_quote && (c == quote_c)) {
872 in_quote = false;
873 } else {
874 token[pos++] = c;
875 }
876 }
877 c = getc(stream);
878 }
879 if (pos > 0) {
880 token[pos] = '\0';
881 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
882 build_jvm_flags(token);
883 }
884 fclose(stream);
885 return result;
886 }
887
888 //=============================================================================================================
889 // Parsing of properties (-D)
890
891 const char* Arguments::get_property(const char* key) {
892 return PropertyList_get_value(system_properties(), key);
893 }
894
895 bool Arguments::add_property(const char* prop) {
896 const char* eq = strchr(prop, '=');
897 char* key;
898 // ns must be static--its address may be stored in a SystemProperty object.
899 const static char ns[1] = {0};
900 char* value = (char *)ns;
901
902 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
903 key = AllocateHeap(key_len + 1, "add_property");
904 strncpy(key, prop, key_len);
905 key[key_len] = '\0';
906
907 if (eq != NULL) {
908 size_t value_len = strlen(prop) - key_len - 1;
909 value = AllocateHeap(value_len + 1, "add_property");
910 strncpy(value, &prop[key_len + 1], value_len + 1);
911 }
912
913 if (strcmp(key, "java.compiler") == 0) {
914 process_java_compiler_argument(value);
915 FreeHeap(key);
916 if (eq != NULL) {
917 FreeHeap(value);
918 }
919 return true;
920 } else if (strcmp(key, "sun.java.command") == 0) {
921 _java_command = value;
922
923 // Record value in Arguments, but let it get passed to Java.
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 #ifndef ZERO
966 // Turn these off for mixed and comp. Leave them on for Zero.
967 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
968 UseFastAccessorMethods = mode == _int;
969 }
970 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
971 UseFastEmptyMethods = mode == _int;
972 }
973 #endif
974
975 // Default values may be platform/compiler dependent -
976 // use the saved values
977 ClipInlining = Arguments::_ClipInlining;
978 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
979 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
980 BackgroundCompilation = Arguments::_BackgroundCompilation;
981
982 // Change from defaults based on mode
983 switch (mode) {
984 default:
985 ShouldNotReachHere();
986 break;
987 case _int:
988 UseCompiler = false;
989 UseLoopCounter = false;
990 AlwaysCompileLoopMethods = false;
991 UseOnStackReplacement = false;
992 break;
993 case _mixed:
994 // same as default
995 break;
996 case _comp:
997 UseInterpreter = false;
998 BackgroundCompilation = false;
999 ClipInlining = false;
1000 break;
1001 }
1002 }
1003
1004 // Conflict: required to use shared spaces (-Xshare:on), but
1005 // incompatible command line options were chosen.
1006
1007 static void no_shared_spaces() {
1008 if (RequireSharedSpaces) {
1009 jio_fprintf(defaultStream::error_stream(),
1010 "Class data sharing is inconsistent with other specified options.\n");
1011 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1012 } else {
1013 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1014 }
1015 }
1016
1017 void Arguments::set_tiered_flags() {
1018 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1019 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1020 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1021 }
1022 if (CompilationPolicyChoice < 2) {
1023 vm_exit_during_initialization(
1024 "Incompatible compilation policy selected", NULL);
1025 }
1026 // Increase the code cache size - tiered compiles a lot more.
1027 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1028 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1029 }
1030 }
1031
1032 #ifndef KERNEL
1033 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1034 // if it's not explictly set or unset. If the user has chosen
1035 // UseParNewGC and not explicitly set ParallelGCThreads we
1036 // set it, unless this is a single cpu machine.
1037 void Arguments::set_parnew_gc_flags() {
1038 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1039 "control point invariant");
1040 assert(UseParNewGC, "Error");
1041
1042 // Turn off AdaptiveSizePolicy by default for parnew until it is
1043 // complete.
1044 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1045 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1046 }
1047
1048 if (ParallelGCThreads == 0) {
1049 FLAG_SET_DEFAULT(ParallelGCThreads,
1050 Abstract_VM_Version::parallel_worker_threads());
1051 if (ParallelGCThreads == 1) {
1052 FLAG_SET_DEFAULT(UseParNewGC, false);
1053 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1054 }
1055 }
1056 if (UseParNewGC) {
1057 // CDS doesn't work with ParNew yet
1058 no_shared_spaces();
1059
1060 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1061 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1062 // we set them to 1024 and 1024.
1063 // See CR 6362902.
1064 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1065 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1066 }
1067 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1068 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1069 }
1070
1071 // AlwaysTenure flag should make ParNew promote all at first collection.
1072 // See CR 6362902.
1073 if (AlwaysTenure) {
1074 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1075 }
1076 // When using compressed oops, we use local overflow stacks,
1077 // rather than using a global overflow list chained through
1078 // the klass word of the object's pre-image.
1079 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1080 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1081 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1082 }
1083 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1084 }
1085 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1086 }
1087 }
1088
1089 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1090 // sparc/solaris for certain applications, but would gain from
1091 // further optimization and tuning efforts, and would almost
1092 // certainly gain from analysis of platform and environment.
1093 void Arguments::set_cms_and_parnew_gc_flags() {
1094 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1095 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1096
1097 // If we are using CMS, we prefer to UseParNewGC,
1098 // unless explicitly forbidden.
1099 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1100 FLAG_SET_ERGO(bool, UseParNewGC, true);
1101 }
1102
1103 // Turn off AdaptiveSizePolicy by default for cms until it is
1104 // complete.
1105 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1106 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1107 }
1108
1109 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1110 // as needed.
1111 if (UseParNewGC) {
1112 set_parnew_gc_flags();
1113 }
1114
1115 // MaxHeapSize is aligned down in collectorPolicy
1116 size_t max_heap = align_size_down(MaxHeapSize,
1117 CardTableRS::ct_max_alignment_constraint());
1118
1119 // Now make adjustments for CMS
1120 intx tenuring_default = (intx)6;
1121 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1122
1123 // Preferred young gen size for "short" pauses:
1124 // upper bound depends on # of threads and NewRatio.
1125 const uintx parallel_gc_threads =
1126 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1127 const size_t preferred_max_new_size_unaligned =
1128 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1129 size_t preferred_max_new_size =
1130 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1131
1132 // Unless explicitly requested otherwise, size young gen
1133 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1134
1135 // If either MaxNewSize or NewRatio is set on the command line,
1136 // assume the user is trying to set the size of the young gen.
1137 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1138
1139 // Set MaxNewSize to our calculated preferred_max_new_size unless
1140 // NewSize was set on the command line and it is larger than
1141 // preferred_max_new_size.
1142 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1143 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1144 } else {
1145 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1146 }
1147 if (PrintGCDetails && Verbose) {
1148 // Too early to use gclog_or_tty
1149 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1150 }
1151
1152 // Code along this path potentially sets NewSize and OldSize
1153
1154 assert(max_heap >= InitialHeapSize, "Error");
1155 assert(max_heap >= NewSize, "Error");
1156
1157 if (PrintGCDetails && Verbose) {
1158 // Too early to use gclog_or_tty
1159 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1160 " initial_heap_size: " SIZE_FORMAT
1161 " max_heap: " SIZE_FORMAT,
1162 min_heap_size(), InitialHeapSize, max_heap);
1163 }
1164 size_t min_new = preferred_max_new_size;
1165 if (FLAG_IS_CMDLINE(NewSize)) {
1166 min_new = NewSize;
1167 }
1168 if (max_heap > min_new && min_heap_size() > min_new) {
1169 // Unless explicitly requested otherwise, make young gen
1170 // at least min_new, and at most preferred_max_new_size.
1171 if (FLAG_IS_DEFAULT(NewSize)) {
1172 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1173 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1174 if (PrintGCDetails && Verbose) {
1175 // Too early to use gclog_or_tty
1176 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1177 }
1178 }
1179 // Unless explicitly requested otherwise, size old gen
1180 // so it's NewRatio x of NewSize.
1181 if (FLAG_IS_DEFAULT(OldSize)) {
1182 if (max_heap > NewSize) {
1183 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1184 if (PrintGCDetails && Verbose) {
1185 // Too early to use gclog_or_tty
1186 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1187 }
1188 }
1189 }
1190 }
1191 }
1192 // Unless explicitly requested otherwise, definitely
1193 // promote all objects surviving "tenuring_default" scavenges.
1194 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1195 FLAG_IS_DEFAULT(SurvivorRatio)) {
1196 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1197 }
1198 // If we decided above (or user explicitly requested)
1199 // `promote all' (via MaxTenuringThreshold := 0),
1200 // prefer minuscule survivor spaces so as not to waste
1201 // space for (non-existent) survivors
1202 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1203 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1204 }
1205 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1206 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1207 // This is done in order to make ParNew+CMS configuration to work
1208 // with YoungPLABSize and OldPLABSize options.
1209 // See CR 6362902.
1210 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1211 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1212 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1213 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1214 // the value (either from the command line or ergonomics) of
1215 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1216 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1217 } else {
1218 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1219 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1220 // we'll let it to take precedence.
1221 jio_fprintf(defaultStream::error_stream(),
1222 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1223 " options are specified for the CMS collector."
1224 " CMSParPromoteBlocksToClaim will take precedence.\n");
1225 }
1226 }
1227 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1228 // OldPLAB sizing manually turned off: Use a larger default setting,
1229 // unless it was manually specified. This is because a too-low value
1230 // will slow down scavenges.
1231 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1232 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1233 }
1234 }
1235 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1236 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1237 // If either of the static initialization defaults have changed, note this
1238 // modification.
1239 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1240 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1241 }
1242 if (PrintGCDetails && Verbose) {
1243 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1244 MarkStackSize / K, MarkStackSizeMax / K);
1245 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1246 }
1247 }
1248 #endif // KERNEL
1249
1250 void set_object_alignment() {
1251 // Object alignment.
1252 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1253 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1254 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1255 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1256 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1257 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1258
1259 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1260 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1261
1262 // Oop encoding heap max
1263 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1264
1265 #ifndef KERNEL
1266 // Set CMS global values
1267 CompactibleFreeListSpace::set_cms_values();
1268 #endif // KERNEL
1269 }
1270
1271 bool verify_object_alignment() {
1272 // Object alignment.
1273 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1274 jio_fprintf(defaultStream::error_stream(),
1275 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1276 (int)ObjectAlignmentInBytes);
1277 return false;
1278 }
1279 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1280 jio_fprintf(defaultStream::error_stream(),
1281 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1282 (int)ObjectAlignmentInBytes, BytesPerLong);
1283 return false;
1284 }
1285 // It does not make sense to have big object alignment
1286 // since a space lost due to alignment will be greater
1287 // then a saved space from compressed oops.
1288 if ((int)ObjectAlignmentInBytes > 256) {
1289 jio_fprintf(defaultStream::error_stream(),
1290 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1291 (int)ObjectAlignmentInBytes);
1292 return false;
1293 }
1294 // In case page size is very small.
1295 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1296 jio_fprintf(defaultStream::error_stream(),
1297 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1298 (int)ObjectAlignmentInBytes, os::vm_page_size());
1299 return false;
1300 }
1301 return true;
1302 }
1303
1304 inline uintx max_heap_for_compressed_oops() {
1305 // Avoid sign flip.
1306 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1307 return 0;
1308 }
1309 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1310 NOT_LP64(ShouldNotReachHere(); return 0);
1311 }
1312
1313 bool Arguments::should_auto_select_low_pause_collector() {
1314 if (UseAutoGCSelectPolicy &&
1315 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1316 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1317 if (PrintGCDetails) {
1318 // Cannot use gclog_or_tty yet.
1319 tty->print_cr("Automatic selection of the low pause collector"
1320 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1321 }
1322 return true;
1323 }
1324 return false;
1325 }
1326
1327 void Arguments::set_ergonomics_flags() {
1328 // Parallel GC is not compatible with sharing. If one specifies
1329 // that they want sharing explicitly, do not set ergonomics flags.
1330 if (DumpSharedSpaces || RequireSharedSpaces) {
1331 return;
1332 }
1333
1334 if (os::is_server_class_machine() && !force_client_mode ) {
1335 // If no other collector is requested explicitly,
1336 // let the VM select the collector based on
1337 // machine class and automatic selection policy.
1338 if (!UseSerialGC &&
1339 !UseConcMarkSweepGC &&
1340 !UseG1GC &&
1341 !UseParNewGC &&
1342 !DumpSharedSpaces &&
1343 FLAG_IS_DEFAULT(UseParallelGC)) {
1344 if (should_auto_select_low_pause_collector()) {
1345 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1346 } else {
1347 FLAG_SET_ERGO(bool, UseParallelGC, true);
1348 }
1349 no_shared_spaces();
1350 }
1351 }
1352
1353 #ifndef ZERO
1354 #ifdef _LP64
1355 // Check that UseCompressedOops can be set with the max heap size allocated
1356 // by ergonomics.
1357 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1358 #if !defined(COMPILER1) || defined(TIERED)
1359 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1360 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1361 }
1362 #endif
1363 #ifdef _WIN64
1364 if (UseLargePages && UseCompressedOops) {
1365 // Cannot allocate guard pages for implicit checks in indexed addressing
1366 // mode, when large pages are specified on windows.
1367 // This flag could be switched ON if narrow oop base address is set to 0,
1368 // see code in Universe::initialize_heap().
1369 Universe::set_narrow_oop_use_implicit_null_checks(false);
1370 }
1371 #endif // _WIN64
1372 } else {
1373 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1374 warning("Max heap size too large for Compressed Oops");
1375 FLAG_SET_DEFAULT(UseCompressedOops, false);
1376 }
1377 }
1378 // Also checks that certain machines are slower with compressed oops
1379 // in vm_version initialization code.
1380 #endif // _LP64
1381 #endif // !ZERO
1382 }
1383
1384 void Arguments::set_parallel_gc_flags() {
1385 assert(UseParallelGC || UseParallelOldGC, "Error");
1386 // If parallel old was requested, automatically enable parallel scavenge.
1387 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1388 FLAG_SET_DEFAULT(UseParallelGC, true);
1389 }
1390
1391 // If no heap maximum was requested explicitly, use some reasonable fraction
1392 // of the physical memory, up to a maximum of 1GB.
1393 if (UseParallelGC) {
1394 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1395 Abstract_VM_Version::parallel_worker_threads());
1396
1397 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1398 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1399 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1400 // See CR 6362902 for details.
1401 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1402 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1403 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1404 }
1405 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1406 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1407 }
1408 }
1409
1410 if (UseParallelOldGC) {
1411 // Par compact uses lower default values since they are treated as
1412 // minimums. These are different defaults because of the different
1413 // interpretation and are not ergonomically set.
1414 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1415 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1416 }
1417 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1418 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1419 }
1420 }
1421 }
1422 }
1423
1424 void Arguments::set_g1_gc_flags() {
1425 assert(UseG1GC, "Error");
1426 #ifdef COMPILER1
1427 FastTLABRefill = false;
1428 #endif
1429 FLAG_SET_DEFAULT(ParallelGCThreads,
1430 Abstract_VM_Version::parallel_worker_threads());
1431 if (ParallelGCThreads == 0) {
1432 FLAG_SET_DEFAULT(ParallelGCThreads,
1433 Abstract_VM_Version::parallel_worker_threads());
1434 }
1435 no_shared_spaces();
1436
1437 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1438 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1439 }
1440 if (PrintGCDetails && Verbose) {
1441 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1442 MarkStackSize / K, MarkStackSizeMax / K);
1443 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1444 }
1445
1446 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1447 // In G1, we want the default GC overhead goal to be higher than
1448 // say in PS. So we set it here to 10%. Otherwise the heap might
1449 // be expanded more aggressively than we would like it to. In
1450 // fact, even 10% seems to not be high enough in some cases
1451 // (especially small GC stress tests that the main thing they do
1452 // is allocation). We might consider increase it further.
1453 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1454 }
1455 }
1456
1457 void Arguments::set_heap_size() {
1458 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1459 // Deprecated flag
1460 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1461 }
1462
1463 const julong phys_mem =
1464 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1465 : (julong)MaxRAM;
1466
1467 // If the maximum heap size has not been set with -Xmx,
1468 // then set it as fraction of the size of physical memory,
1469 // respecting the maximum and minimum sizes of the heap.
1470 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1471 julong reasonable_max = phys_mem / MaxRAMFraction;
1472
1473 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1474 // Small physical memory, so use a minimum fraction of it for the heap
1475 reasonable_max = phys_mem / MinRAMFraction;
1476 } else {
1477 // Not-small physical memory, so require a heap at least
1478 // as large as MaxHeapSize
1479 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1480 }
1481 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1482 // Limit the heap size to ErgoHeapSizeLimit
1483 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1484 }
1485 if (UseCompressedOops) {
1486 // Limit the heap size to the maximum possible when using compressed oops
1487 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1488 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1489 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1490 // but it should be not less than default MaxHeapSize.
1491 max_coop_heap -= HeapBaseMinAddress;
1492 }
1493 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1494 }
1495 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1496
1497 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1498 // An initial heap size was specified on the command line,
1499 // so be sure that the maximum size is consistent. Done
1500 // after call to allocatable_physical_memory because that
1501 // method might reduce the allocation size.
1502 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1503 }
1504
1505 if (PrintGCDetails && Verbose) {
1506 // Cannot use gclog_or_tty yet.
1507 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1508 }
1509 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1510 }
1511
1512 // If the initial_heap_size has not been set with InitialHeapSize
1513 // or -Xms, then set it as fraction of the size of physical memory,
1514 // respecting the maximum and minimum sizes of the heap.
1515 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1516 julong reasonable_minimum = (julong)(OldSize + NewSize);
1517
1518 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1519
1520 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1521
1522 julong reasonable_initial = phys_mem / InitialRAMFraction;
1523
1524 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1525 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1526
1527 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1528
1529 if (PrintGCDetails && Verbose) {
1530 // Cannot use gclog_or_tty yet.
1531 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1532 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1533 }
1534 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1535 set_min_heap_size((uintx)reasonable_minimum);
1536 }
1537 }
1538
1539 // This must be called after ergonomics because we want bytecode rewriting
1540 // if the server compiler is used, or if UseSharedSpaces is disabled.
1541 void Arguments::set_bytecode_flags() {
1542 // Better not attempt to store into a read-only space.
1543 if (UseSharedSpaces) {
1544 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1545 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1546 }
1547
1548 if (!RewriteBytecodes) {
1549 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1550 }
1551 }
1552
1553 // Aggressive optimization flags -XX:+AggressiveOpts
1554 void Arguments::set_aggressive_opts_flags() {
1555 #ifdef COMPILER2
1556 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1557 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1558 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1559 }
1560 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1561 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1562 }
1563
1564 // Feed the cache size setting into the JDK
1565 char buffer[1024];
1566 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1567 add_property(buffer);
1568 }
1569 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1570 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1571 }
1572 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1573 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1574 }
1575 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1576 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1577 }
1578 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1579 FLAG_SET_DEFAULT(OptimizeFill, true);
1580 }
1581 #endif
1582
1583 if (AggressiveOpts) {
1584 // Sample flag setting code
1585 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1586 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1587 // }
1588 }
1589 }
1590
1591 //===========================================================================================================
1592 // Parsing of java.compiler property
1593
1594 void Arguments::process_java_compiler_argument(char* arg) {
1595 // For backwards compatibility, Djava.compiler=NONE or ""
1596 // causes us to switch to -Xint mode UNLESS -Xdebug
1597 // is also specified.
1598 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1599 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1600 }
1601 }
1602
1603 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1604 _sun_java_launcher = strdup(launcher);
1605 if (strcmp("gamma", _sun_java_launcher) == 0) {
1606 _created_by_gamma_launcher = true;
1607 }
1608 }
1609
1610 bool Arguments::created_by_java_launcher() {
1611 assert(_sun_java_launcher != NULL, "property must have value");
1612 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1613 }
1614
1615 bool Arguments::created_by_gamma_launcher() {
1616 return _created_by_gamma_launcher;
1617 }
1618
1619 //===========================================================================================================
1620 // Parsing of main arguments
1621
1622 bool Arguments::verify_interval(uintx val, uintx min,
1623 uintx max, const char* name) {
1624 // Returns true iff value is in the inclusive interval [min..max]
1625 // false, otherwise.
1626 if (val >= min && val <= max) {
1627 return true;
1628 }
1629 jio_fprintf(defaultStream::error_stream(),
1630 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1631 " and " UINTX_FORMAT "\n",
1632 name, val, min, max);
1633 return false;
1634 }
1635
1636 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1637 // Returns true if given value is at least specified min threshold
1638 // false, otherwise.
1639 if (val >= min ) {
1640 return true;
1641 }
1642 jio_fprintf(defaultStream::error_stream(),
1643 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1644 name, val, min);
1645 return false;
1646 }
1647
1648 bool Arguments::verify_percentage(uintx value, const char* name) {
1649 if (value <= 100) {
1650 return true;
1651 }
1652 jio_fprintf(defaultStream::error_stream(),
1653 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1654 name, value);
1655 return false;
1656 }
1657
1658 static void force_serial_gc() {
1659 FLAG_SET_DEFAULT(UseSerialGC, true);
1660 FLAG_SET_DEFAULT(UseParNewGC, false);
1661 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1662 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1663 FLAG_SET_DEFAULT(UseParallelGC, false);
1664 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1665 FLAG_SET_DEFAULT(UseG1GC, false);
1666 }
1667
1668 static bool verify_serial_gc_flags() {
1669 return (UseSerialGC &&
1670 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1671 UseParallelGC || UseParallelOldGC));
1672 }
1673
1674 // Check consistency of GC selection
1675 bool Arguments::check_gc_consistency() {
1676 bool status = true;
1677 // Ensure that the user has not selected conflicting sets
1678 // of collectors. [Note: this check is merely a user convenience;
1679 // collectors over-ride each other so that only a non-conflicting
1680 // set is selected; however what the user gets is not what they
1681 // may have expected from the combination they asked for. It's
1682 // better to reduce user confusion by not allowing them to
1683 // select conflicting combinations.
1684 uint i = 0;
1685 if (UseSerialGC) i++;
1686 if (UseConcMarkSweepGC || UseParNewGC) i++;
1687 if (UseParallelGC || UseParallelOldGC) i++;
1688 if (UseG1GC) i++;
1689 if (i > 1) {
1690 jio_fprintf(defaultStream::error_stream(),
1691 "Conflicting collector combinations in option list; "
1692 "please refer to the release notes for the combinations "
1693 "allowed\n");
1694 status = false;
1695 }
1696
1697 return status;
1698 }
1699
1700 // Check stack pages settings
1701 bool Arguments::check_stack_pages()
1702 {
1703 bool status = true;
1704 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1705 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1706 // greater stack shadow pages can't generate instruction to bang stack
1707 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1708 return status;
1709 }
1710
1711 // Check the consistency of vm_init_args
1712 bool Arguments::check_vm_args_consistency() {
1713 // Method for adding checks for flag consistency.
1714 // The intent is to warn the user of all possible conflicts,
1715 // before returning an error.
1716 // Note: Needs platform-dependent factoring.
1717 bool status = true;
1718
1719 #if ( (defined(COMPILER2) && defined(SPARC)))
1720 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1721 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1722 // x86. Normally, VM_Version_init must be called from init_globals in
1723 // init.cpp, which is called by the initial java thread *after* arguments
1724 // have been parsed. VM_Version_init gets called twice on sparc.
1725 extern void VM_Version_init();
1726 VM_Version_init();
1727 if (!VM_Version::has_v9()) {
1728 jio_fprintf(defaultStream::error_stream(),
1729 "V8 Machine detected, Server requires V9\n");
1730 status = false;
1731 }
1732 #endif /* COMPILER2 && SPARC */
1733
1734 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1735 // builds so the cost of stack banging can be measured.
1736 #if (defined(PRODUCT) && defined(SOLARIS))
1737 if (!UseBoundThreads && !UseStackBanging) {
1738 jio_fprintf(defaultStream::error_stream(),
1739 "-UseStackBanging conflicts with -UseBoundThreads\n");
1740
1741 status = false;
1742 }
1743 #endif
1744
1745 if (TLABRefillWasteFraction == 0) {
1746 jio_fprintf(defaultStream::error_stream(),
1747 "TLABRefillWasteFraction should be a denominator, "
1748 "not " SIZE_FORMAT "\n",
1749 TLABRefillWasteFraction);
1750 status = false;
1751 }
1752
1753 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1754 "AdaptiveSizePolicyWeight");
1755 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1756 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1757 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1758 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1759
1760 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1761 jio_fprintf(defaultStream::error_stream(),
1762 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1763 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1764 MinHeapFreeRatio, MaxHeapFreeRatio);
1765 status = false;
1766 }
1767 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1768 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1769
1770 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1771 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1772 }
1773
1774 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1775 // Settings to encourage splitting.
1776 if (!FLAG_IS_CMDLINE(NewRatio)) {
1777 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1778 }
1779 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1780 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1781 }
1782 }
1783
1784 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1785 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1786 if (GCTimeLimit == 100) {
1787 // Turn off gc-overhead-limit-exceeded checks
1788 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1789 }
1790
1791 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1792
1793 status = status && check_gc_consistency();
1794 status = status && check_stack_pages();
1795
1796 if (_has_alloc_profile) {
1797 if (UseParallelGC || UseParallelOldGC) {
1798 jio_fprintf(defaultStream::error_stream(),
1799 "error: invalid argument combination.\n"
1800 "Allocation profiling (-Xaprof) cannot be used together with "
1801 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1802 status = false;
1803 }
1804 if (UseConcMarkSweepGC) {
1805 jio_fprintf(defaultStream::error_stream(),
1806 "error: invalid argument combination.\n"
1807 "Allocation profiling (-Xaprof) cannot be used together with "
1808 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1809 status = false;
1810 }
1811 }
1812
1813 if (CMSIncrementalMode) {
1814 if (!UseConcMarkSweepGC) {
1815 jio_fprintf(defaultStream::error_stream(),
1816 "error: invalid argument combination.\n"
1817 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1818 "selected in order\nto use CMSIncrementalMode.\n");
1819 status = false;
1820 } else {
1821 status = status && verify_percentage(CMSIncrementalDutyCycle,
1822 "CMSIncrementalDutyCycle");
1823 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1824 "CMSIncrementalDutyCycleMin");
1825 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1826 "CMSIncrementalSafetyFactor");
1827 status = status && verify_percentage(CMSIncrementalOffset,
1828 "CMSIncrementalOffset");
1829 status = status && verify_percentage(CMSExpAvgFactor,
1830 "CMSExpAvgFactor");
1831 // If it was not set on the command line, set
1832 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1833 if (CMSInitiatingOccupancyFraction < 0) {
1834 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1835 }
1836 }
1837 }
1838
1839 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1840 // insists that we hold the requisite locks so that the iteration is
1841 // MT-safe. For the verification at start-up and shut-down, we don't
1842 // yet have a good way of acquiring and releasing these locks,
1843 // which are not visible at the CollectedHeap level. We want to
1844 // be able to acquire these locks and then do the iteration rather
1845 // than just disable the lock verification. This will be fixed under
1846 // bug 4788986.
1847 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1848 if (VerifyGCStartAt == 0) {
1849 warning("Heap verification at start-up disabled "
1850 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1851 VerifyGCStartAt = 1; // Disable verification at start-up
1852 }
1853 if (VerifyBeforeExit) {
1854 warning("Heap verification at shutdown disabled "
1855 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1856 VerifyBeforeExit = false; // Disable verification at shutdown
1857 }
1858 }
1859
1860 // Note: only executed in non-PRODUCT mode
1861 if (!UseAsyncConcMarkSweepGC &&
1862 (ExplicitGCInvokesConcurrent ||
1863 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1864 jio_fprintf(defaultStream::error_stream(),
1865 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1866 " with -UseAsyncConcMarkSweepGC");
1867 status = false;
1868 }
1869
1870 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1871
1872 #ifndef SERIALGC
1873 if (UseG1GC) {
1874 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1875 "InitiatingHeapOccupancyPercent");
1876 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1877 "G1RefProcDrainInterval");
1878 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1879 "G1ConcMarkStepDurationMillis");
1880 }
1881 #endif
1882
1883 status = status && verify_interval(RefDiscoveryPolicy,
1884 ReferenceProcessor::DiscoveryPolicyMin,
1885 ReferenceProcessor::DiscoveryPolicyMax,
1886 "RefDiscoveryPolicy");
1887
1888 // Limit the lower bound of this flag to 1 as it is used in a division
1889 // expression.
1890 status = status && verify_interval(TLABWasteTargetPercent,
1891 1, 100, "TLABWasteTargetPercent");
1892
1893 status = status && verify_object_alignment();
1894
1895 return status;
1896 }
1897
1898 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1899 const char* option_type) {
1900 if (ignore) return false;
1901
1902 const char* spacer = " ";
1903 if (option_type == NULL) {
1904 option_type = ++spacer; // Set both to the empty string.
1905 }
1906
1907 if (os::obsolete_option(option)) {
1908 jio_fprintf(defaultStream::error_stream(),
1909 "Obsolete %s%soption: %s\n", option_type, spacer,
1910 option->optionString);
1911 return false;
1912 } else {
1913 jio_fprintf(defaultStream::error_stream(),
1914 "Unrecognized %s%soption: %s\n", option_type, spacer,
1915 option->optionString);
1916 return true;
1917 }
1918 }
1919
1920 static const char* user_assertion_options[] = {
1921 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1922 };
1923
1924 static const char* system_assertion_options[] = {
1925 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1926 };
1927
1928 // Return true if any of the strings in null-terminated array 'names' matches.
1929 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1930 // the option must match exactly.
1931 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1932 bool tail_allowed) {
1933 for (/* empty */; *names != NULL; ++names) {
1934 if (match_option(option, *names, tail)) {
1935 if (**tail == '\0' || tail_allowed && **tail == ':') {
1936 return true;
1937 }
1938 }
1939 }
1940 return false;
1941 }
1942
1943 bool Arguments::parse_uintx(const char* value,
1944 uintx* uintx_arg,
1945 uintx min_size) {
1946
1947 // Check the sign first since atomull() parses only unsigned values.
1948 bool value_is_positive = !(*value == '-');
1949
1950 if (value_is_positive) {
1951 julong n;
1952 bool good_return = atomull(value, &n);
1953 if (good_return) {
1954 bool above_minimum = n >= min_size;
1955 bool value_is_too_large = n > max_uintx;
1956
1957 if (above_minimum && !value_is_too_large) {
1958 *uintx_arg = n;
1959 return true;
1960 }
1961 }
1962 }
1963 return false;
1964 }
1965
1966 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1967 julong* long_arg,
1968 julong min_size) {
1969 if (!atomull(s, long_arg)) return arg_unreadable;
1970 return check_memory_size(*long_arg, min_size);
1971 }
1972
1973 // Parse JavaVMInitArgs structure
1974
1975 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1976 // For components of the system classpath.
1977 SysClassPath scp(Arguments::get_sysclasspath());
1978 bool scp_assembly_required = false;
1979
1980 // Save default settings for some mode flags
1981 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1982 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1983 Arguments::_ClipInlining = ClipInlining;
1984 Arguments::_BackgroundCompilation = BackgroundCompilation;
1985
1986 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1987 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1988 if (result != JNI_OK) {
1989 return result;
1990 }
1991
1992 // Parse JavaVMInitArgs structure passed in
1993 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1994 if (result != JNI_OK) {
1995 return result;
1996 }
1997
1998 if (AggressiveOpts) {
1999 // Insert alt-rt.jar between user-specified bootclasspath
2000 // prefix and the default bootclasspath. os::set_boot_path()
2001 // uses meta_index_dir as the default bootclasspath directory.
2002 const char* altclasses_jar = "alt-rt.jar";
2003 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2004 strlen(altclasses_jar);
2005 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2006 strcpy(altclasses_path, get_meta_index_dir());
2007 strcat(altclasses_path, altclasses_jar);
2008 scp.add_suffix_to_prefix(altclasses_path);
2009 scp_assembly_required = true;
2010 FREE_C_HEAP_ARRAY(char, altclasses_path);
2011 }
2012
2013 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2014 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2015 if (result != JNI_OK) {
2016 return result;
2017 }
2018
2019 // Do final processing now that all arguments have been parsed
2020 result = finalize_vm_init_args(&scp, scp_assembly_required);
2021 if (result != JNI_OK) {
2022 return result;
2023 }
2024
2025 return JNI_OK;
2026 }
2027
2028 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2029 SysClassPath* scp_p,
2030 bool* scp_assembly_required_p,
2031 FlagValueOrigin origin) {
2032 // Remaining part of option string
2033 const char* tail;
2034
2035 // iterate over arguments
2036 for (int index = 0; index < args->nOptions; index++) {
2037 bool is_absolute_path = false; // for -agentpath vs -agentlib
2038
2039 const JavaVMOption* option = args->options + index;
2040
2041 if (!match_option(option, "-Djava.class.path", &tail) &&
2042 !match_option(option, "-Dsun.java.command", &tail) &&
2043 !match_option(option, "-Dsun.java.launcher", &tail)) {
2044
2045 // add all jvm options to the jvm_args string. This string
2046 // is used later to set the java.vm.args PerfData string constant.
2047 // the -Djava.class.path and the -Dsun.java.command options are
2048 // omitted from jvm_args string as each have their own PerfData
2049 // string constant object.
2050 build_jvm_args(option->optionString);
2051 }
2052
2053 // -verbose:[class/gc/jni]
2054 if (match_option(option, "-verbose", &tail)) {
2055 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2056 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2057 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2058 } else if (!strcmp(tail, ":gc")) {
2059 FLAG_SET_CMDLINE(bool, PrintGC, true);
2060 } else if (!strcmp(tail, ":jni")) {
2061 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2062 }
2063 // -da / -ea / -disableassertions / -enableassertions
2064 // These accept an optional class/package name separated by a colon, e.g.,
2065 // -da:java.lang.Thread.
2066 } else if (match_option(option, user_assertion_options, &tail, true)) {
2067 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2068 if (*tail == '\0') {
2069 JavaAssertions::setUserClassDefault(enable);
2070 } else {
2071 assert(*tail == ':', "bogus match by match_option()");
2072 JavaAssertions::addOption(tail + 1, enable);
2073 }
2074 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2075 } else if (match_option(option, system_assertion_options, &tail, false)) {
2076 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2077 JavaAssertions::setSystemClassDefault(enable);
2078 // -bootclasspath:
2079 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2080 scp_p->reset_path(tail);
2081 *scp_assembly_required_p = true;
2082 // -bootclasspath/a:
2083 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2084 scp_p->add_suffix(tail);
2085 *scp_assembly_required_p = true;
2086 // -bootclasspath/p:
2087 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2088 scp_p->add_prefix(tail);
2089 *scp_assembly_required_p = true;
2090 // -Xrun
2091 } else if (match_option(option, "-Xrun", &tail)) {
2092 if (tail != NULL) {
2093 const char* pos = strchr(tail, ':');
2094 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2095 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2096 name[len] = '\0';
2097
2098 char *options = NULL;
2099 if(pos != NULL) {
2100 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2101 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2102 }
2103 #ifdef JVMTI_KERNEL
2104 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2105 warning("profiling and debugging agents are not supported with Kernel VM");
2106 } else
2107 #endif // JVMTI_KERNEL
2108 add_init_library(name, options);
2109 }
2110 // -agentlib and -agentpath
2111 } else if (match_option(option, "-agentlib:", &tail) ||
2112 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2113 if(tail != NULL) {
2114 const char* pos = strchr(tail, '=');
2115 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2116 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2117 name[len] = '\0';
2118
2119 char *options = NULL;
2120 if(pos != NULL) {
2121 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2122 }
2123 #ifdef JVMTI_KERNEL
2124 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2125 warning("profiling and debugging agents are not supported with Kernel VM");
2126 } else
2127 #endif // JVMTI_KERNEL
2128 add_init_agent(name, options, is_absolute_path);
2129
2130 }
2131 // -javaagent
2132 } else if (match_option(option, "-javaagent:", &tail)) {
2133 if(tail != NULL) {
2134 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2135 add_init_agent("instrument", options, false);
2136 }
2137 // -Xnoclassgc
2138 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2139 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2140 // -Xincgc: i-CMS
2141 } else if (match_option(option, "-Xincgc", &tail)) {
2142 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2143 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2144 // -Xnoincgc: no i-CMS
2145 } else if (match_option(option, "-Xnoincgc", &tail)) {
2146 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2147 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2148 // -Xconcgc
2149 } else if (match_option(option, "-Xconcgc", &tail)) {
2150 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2151 // -Xnoconcgc
2152 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2153 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2154 // -Xbatch
2155 } else if (match_option(option, "-Xbatch", &tail)) {
2156 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2157 // -Xmn for compatibility with other JVM vendors
2158 } else if (match_option(option, "-Xmn", &tail)) {
2159 julong long_initial_eden_size = 0;
2160 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2161 if (errcode != arg_in_range) {
2162 jio_fprintf(defaultStream::error_stream(),
2163 "Invalid initial eden size: %s\n", option->optionString);
2164 describe_range_error(errcode);
2165 return JNI_EINVAL;
2166 }
2167 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2168 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2169 // -Xms
2170 } else if (match_option(option, "-Xms", &tail)) {
2171 julong long_initial_heap_size = 0;
2172 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2173 if (errcode != arg_in_range) {
2174 jio_fprintf(defaultStream::error_stream(),
2175 "Invalid initial heap size: %s\n", option->optionString);
2176 describe_range_error(errcode);
2177 return JNI_EINVAL;
2178 }
2179 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2180 // Currently the minimum size and the initial heap sizes are the same.
2181 set_min_heap_size(InitialHeapSize);
2182 // -Xmx
2183 } else if (match_option(option, "-Xmx", &tail)) {
2184 julong long_max_heap_size = 0;
2185 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2186 if (errcode != arg_in_range) {
2187 jio_fprintf(defaultStream::error_stream(),
2188 "Invalid maximum heap size: %s\n", option->optionString);
2189 describe_range_error(errcode);
2190 return JNI_EINVAL;
2191 }
2192 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2193 // Xmaxf
2194 } else if (match_option(option, "-Xmaxf", &tail)) {
2195 int maxf = (int)(atof(tail) * 100);
2196 if (maxf < 0 || maxf > 100) {
2197 jio_fprintf(defaultStream::error_stream(),
2198 "Bad max heap free percentage size: %s\n",
2199 option->optionString);
2200 return JNI_EINVAL;
2201 } else {
2202 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2203 }
2204 // Xminf
2205 } else if (match_option(option, "-Xminf", &tail)) {
2206 int minf = (int)(atof(tail) * 100);
2207 if (minf < 0 || minf > 100) {
2208 jio_fprintf(defaultStream::error_stream(),
2209 "Bad min heap free percentage size: %s\n",
2210 option->optionString);
2211 return JNI_EINVAL;
2212 } else {
2213 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2214 }
2215 // -Xss
2216 } else if (match_option(option, "-Xss", &tail)) {
2217 julong long_ThreadStackSize = 0;
2218 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2219 if (errcode != arg_in_range) {
2220 jio_fprintf(defaultStream::error_stream(),
2221 "Invalid thread stack size: %s\n", option->optionString);
2222 describe_range_error(errcode);
2223 return JNI_EINVAL;
2224 }
2225 // Internally track ThreadStackSize in units of 1024 bytes.
2226 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2227 round_to((int)long_ThreadStackSize, K) / K);
2228 // -Xoss
2229 } else if (match_option(option, "-Xoss", &tail)) {
2230 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2231 // -Xmaxjitcodesize
2232 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2233 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2234 julong long_ReservedCodeCacheSize = 0;
2235 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2236 (size_t)InitialCodeCacheSize);
2237 if (errcode != arg_in_range) {
2238 jio_fprintf(defaultStream::error_stream(),
2239 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2240 option->optionString, InitialCodeCacheSize/K);
2241 describe_range_error(errcode);
2242 return JNI_EINVAL;
2243 }
2244 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2245 // -green
2246 } else if (match_option(option, "-green", &tail)) {
2247 jio_fprintf(defaultStream::error_stream(),
2248 "Green threads support not available\n");
2249 return JNI_EINVAL;
2250 // -native
2251 } else if (match_option(option, "-native", &tail)) {
2252 // HotSpot always uses native threads, ignore silently for compatibility
2253 // -Xsqnopause
2254 } else if (match_option(option, "-Xsqnopause", &tail)) {
2255 // EVM option, ignore silently for compatibility
2256 // -Xrs
2257 } else if (match_option(option, "-Xrs", &tail)) {
2258 // Classic/EVM option, new functionality
2259 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2260 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2261 // change default internal VM signals used - lower case for back compat
2262 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2263 // -Xoptimize
2264 } else if (match_option(option, "-Xoptimize", &tail)) {
2265 // EVM option, ignore silently for compatibility
2266 // -Xprof
2267 } else if (match_option(option, "-Xprof", &tail)) {
2268 #ifndef FPROF_KERNEL
2269 _has_profile = true;
2270 #else // FPROF_KERNEL
2271 // do we have to exit?
2272 warning("Kernel VM does not support flat profiling.");
2273 #endif // FPROF_KERNEL
2274 // -Xaprof
2275 } else if (match_option(option, "-Xaprof", &tail)) {
2276 _has_alloc_profile = true;
2277 // -Xconcurrentio
2278 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2279 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2280 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2281 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2282 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2283 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2284
2285 // -Xinternalversion
2286 } else if (match_option(option, "-Xinternalversion", &tail)) {
2287 jio_fprintf(defaultStream::output_stream(), "%s\n",
2288 VM_Version::internal_vm_info_string());
2289 vm_exit(0);
2290 #ifndef PRODUCT
2291 // -Xprintflags
2292 } else if (match_option(option, "-Xprintflags", &tail)) {
2293 CommandLineFlags::printFlags();
2294 vm_exit(0);
2295 #endif
2296 // -D
2297 } else if (match_option(option, "-D", &tail)) {
2298 if (!add_property(tail)) {
2299 return JNI_ENOMEM;
2300 }
2301 // Out of the box management support
2302 if (match_option(option, "-Dcom.sun.management", &tail)) {
2303 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2304 }
2305 // -Xint
2306 } else if (match_option(option, "-Xint", &tail)) {
2307 set_mode_flags(_int);
2308 // -Xmixed
2309 } else if (match_option(option, "-Xmixed", &tail)) {
2310 set_mode_flags(_mixed);
2311 // -Xcomp
2312 } else if (match_option(option, "-Xcomp", &tail)) {
2313 // for testing the compiler; turn off all flags that inhibit compilation
2314 set_mode_flags(_comp);
2315
2316 // -Xshare:dump
2317 } else if (match_option(option, "-Xshare:dump", &tail)) {
2318 #ifdef TIERED
2319 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2320 set_mode_flags(_int); // Prevent compilation, which creates objects
2321 #elif defined(COMPILER2)
2322 vm_exit_during_initialization(
2323 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2324 #elif defined(KERNEL)
2325 vm_exit_during_initialization(
2326 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2327 #else
2328 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2329 set_mode_flags(_int); // Prevent compilation, which creates objects
2330 #endif
2331 // -Xshare:on
2332 } else if (match_option(option, "-Xshare:on", &tail)) {
2333 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2334 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2335 // -Xshare:auto
2336 } else if (match_option(option, "-Xshare:auto", &tail)) {
2337 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2338 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2339 // -Xshare:off
2340 } else if (match_option(option, "-Xshare:off", &tail)) {
2341 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2342 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2343
2344 // -Xverify
2345 } else if (match_option(option, "-Xverify", &tail)) {
2346 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2347 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2348 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2349 } else if (strcmp(tail, ":remote") == 0) {
2350 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2351 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2352 } else if (strcmp(tail, ":none") == 0) {
2353 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2354 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2355 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2356 return JNI_EINVAL;
2357 }
2358 // -Xdebug
2359 } else if (match_option(option, "-Xdebug", &tail)) {
2360 // note this flag has been used, then ignore
2361 set_xdebug_mode(true);
2362 // -Xnoagent
2363 } else if (match_option(option, "-Xnoagent", &tail)) {
2364 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2365 } else if (match_option(option, "-Xboundthreads", &tail)) {
2366 // Bind user level threads to kernel threads (Solaris only)
2367 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2368 } else if (match_option(option, "-Xloggc:", &tail)) {
2369 // Redirect GC output to the file. -Xloggc:<filename>
2370 // ostream_init_log(), when called will use this filename
2371 // to initialize a fileStream.
2372 _gc_log_filename = strdup(tail);
2373 FLAG_SET_CMDLINE(bool, PrintGC, true);
2374 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2375 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2376
2377 // JNI hooks
2378 } else if (match_option(option, "-Xcheck", &tail)) {
2379 if (!strcmp(tail, ":jni")) {
2380 CheckJNICalls = true;
2381 } else if (is_bad_option(option, args->ignoreUnrecognized,
2382 "check")) {
2383 return JNI_EINVAL;
2384 }
2385 } else if (match_option(option, "vfprintf", &tail)) {
2386 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2387 } else if (match_option(option, "exit", &tail)) {
2388 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2389 } else if (match_option(option, "abort", &tail)) {
2390 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2391 // -XX:+AggressiveHeap
2392 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2393
2394 // This option inspects the machine and attempts to set various
2395 // parameters to be optimal for long-running, memory allocation
2396 // intensive jobs. It is intended for machines with large
2397 // amounts of cpu and memory.
2398
2399 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2400 // VM, but we may not be able to represent the total physical memory
2401 // available (like having 8gb of memory on a box but using a 32bit VM).
2402 // Thus, we need to make sure we're using a julong for intermediate
2403 // calculations.
2404 julong initHeapSize;
2405 julong total_memory = os::physical_memory();
2406
2407 if (total_memory < (julong)256*M) {
2408 jio_fprintf(defaultStream::error_stream(),
2409 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2410 vm_exit(1);
2411 }
2412
2413 // The heap size is half of available memory, or (at most)
2414 // all of possible memory less 160mb (leaving room for the OS
2415 // when using ISM). This is the maximum; because adaptive sizing
2416 // is turned on below, the actual space used may be smaller.
2417
2418 initHeapSize = MIN2(total_memory / (julong)2,
2419 total_memory - (julong)160*M);
2420
2421 // Make sure that if we have a lot of memory we cap the 32 bit
2422 // process space. The 64bit VM version of this function is a nop.
2423 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2424
2425 // The perm gen is separate but contiguous with the
2426 // object heap (and is reserved with it) so subtract it
2427 // from the heap size.
2428 if (initHeapSize > MaxPermSize) {
2429 initHeapSize = initHeapSize - MaxPermSize;
2430 } else {
2431 warning("AggressiveHeap and MaxPermSize values may conflict");
2432 }
2433
2434 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2435 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2436 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2437 // Currently the minimum size and the initial heap sizes are the same.
2438 set_min_heap_size(initHeapSize);
2439 }
2440 if (FLAG_IS_DEFAULT(NewSize)) {
2441 // Make the young generation 3/8ths of the total heap.
2442 FLAG_SET_CMDLINE(uintx, NewSize,
2443 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2444 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2445 }
2446
2447 FLAG_SET_DEFAULT(UseLargePages, true);
2448
2449 // Increase some data structure sizes for efficiency
2450 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2451 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2452 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2453
2454 // See the OldPLABSize comment below, but replace 'after promotion'
2455 // with 'after copying'. YoungPLABSize is the size of the survivor
2456 // space per-gc-thread buffers. The default is 4kw.
2457 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2458
2459 // OldPLABSize is the size of the buffers in the old gen that
2460 // UseParallelGC uses to promote live data that doesn't fit in the
2461 // survivor spaces. At any given time, there's one for each gc thread.
2462 // The default size is 1kw. These buffers are rarely used, since the
2463 // survivor spaces are usually big enough. For specjbb, however, there
2464 // are occasions when there's lots of live data in the young gen
2465 // and we end up promoting some of it. We don't have a definite
2466 // explanation for why bumping OldPLABSize helps, but the theory
2467 // is that a bigger PLAB results in retaining something like the
2468 // original allocation order after promotion, which improves mutator
2469 // locality. A minor effect may be that larger PLABs reduce the
2470 // number of PLAB allocation events during gc. The value of 8kw
2471 // was arrived at by experimenting with specjbb.
2472 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2473
2474 // CompilationPolicyChoice=0 causes the server compiler to adopt
2475 // a more conservative which-method-do-I-compile policy when one
2476 // of the counters maintained by the interpreter trips. The
2477 // result is reduced startup time and improved specjbb and
2478 // alacrity performance. Zero is the default, but we set it
2479 // explicitly here in case the default changes.
2480 // See runtime/compilationPolicy.*.
2481 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2482
2483 // Enable parallel GC and adaptive generation sizing
2484 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2485 FLAG_SET_DEFAULT(ParallelGCThreads,
2486 Abstract_VM_Version::parallel_worker_threads());
2487
2488 // Encourage steady state memory management
2489 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2490
2491 // This appears to improve mutator locality
2492 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2493
2494 // Get around early Solaris scheduling bug
2495 // (affinity vs other jobs on system)
2496 // but disallow DR and offlining (5008695).
2497 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2498
2499 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2500 // The last option must always win.
2501 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2502 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2503 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2504 // The last option must always win.
2505 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2506 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2507 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2508 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2509 jio_fprintf(defaultStream::error_stream(),
2510 "Please use CMSClassUnloadingEnabled in place of "
2511 "CMSPermGenSweepingEnabled in the future\n");
2512 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2513 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Please use -XX:+UseGCOverheadLimit in place of "
2516 "-XX:+UseGCTimeLimit in the future\n");
2517 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2518 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2519 jio_fprintf(defaultStream::error_stream(),
2520 "Please use -XX:-UseGCOverheadLimit in place of "
2521 "-XX:-UseGCTimeLimit in the future\n");
2522 // The TLE options are for compatibility with 1.3 and will be
2523 // removed without notice in a future release. These options
2524 // are not to be documented.
2525 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2526 // No longer used.
2527 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2528 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2529 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2530 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2531 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2532 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2533 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2534 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2535 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2536 // No longer used.
2537 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2538 julong long_tlab_size = 0;
2539 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2540 if (errcode != arg_in_range) {
2541 jio_fprintf(defaultStream::error_stream(),
2542 "Invalid TLAB size: %s\n", option->optionString);
2543 describe_range_error(errcode);
2544 return JNI_EINVAL;
2545 }
2546 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2547 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2548 // No longer used.
2549 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2550 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2551 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2552 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2553 SOLARIS_ONLY(
2554 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2555 warning("-XX:+UsePermISM is obsolete.");
2556 FLAG_SET_CMDLINE(bool, UseISM, true);
2557 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2558 FLAG_SET_CMDLINE(bool, UseISM, false);
2559 )
2560 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2561 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2562 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2563 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2564 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2565 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2566 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2567 #ifdef SOLARIS
2568 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2569 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2570 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2571 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2572 #else // ndef SOLARIS
2573 jio_fprintf(defaultStream::error_stream(),
2574 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2575 return JNI_EINVAL;
2576 #endif // ndef SOLARIS
2577 #ifdef ASSERT
2578 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2579 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2580 // disable scavenge before parallel mark-compact
2581 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2582 #endif
2583 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2584 julong cms_blocks_to_claim = (julong)atol(tail);
2585 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2586 jio_fprintf(defaultStream::error_stream(),
2587 "Please use -XX:OldPLABSize in place of "
2588 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2589 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2590 julong cms_blocks_to_claim = (julong)atol(tail);
2591 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2592 jio_fprintf(defaultStream::error_stream(),
2593 "Please use -XX:OldPLABSize in place of "
2594 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2595 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2596 julong old_plab_size = 0;
2597 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2598 if (errcode != arg_in_range) {
2599 jio_fprintf(defaultStream::error_stream(),
2600 "Invalid old PLAB size: %s\n", option->optionString);
2601 describe_range_error(errcode);
2602 return JNI_EINVAL;
2603 }
2604 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2605 jio_fprintf(defaultStream::error_stream(),
2606 "Please use -XX:OldPLABSize in place of "
2607 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2608 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2609 julong young_plab_size = 0;
2610 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2611 if (errcode != arg_in_range) {
2612 jio_fprintf(defaultStream::error_stream(),
2613 "Invalid young PLAB size: %s\n", option->optionString);
2614 describe_range_error(errcode);
2615 return JNI_EINVAL;
2616 }
2617 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2618 jio_fprintf(defaultStream::error_stream(),
2619 "Please use -XX:YoungPLABSize in place of "
2620 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2621 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2622 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2623 julong stack_size = 0;
2624 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2625 if (errcode != arg_in_range) {
2626 jio_fprintf(defaultStream::error_stream(),
2627 "Invalid mark stack size: %s\n", option->optionString);
2628 describe_range_error(errcode);
2629 return JNI_EINVAL;
2630 }
2631 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2632 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2633 julong max_stack_size = 0;
2634 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2635 if (errcode != arg_in_range) {
2636 jio_fprintf(defaultStream::error_stream(),
2637 "Invalid maximum mark stack size: %s\n",
2638 option->optionString);
2639 describe_range_error(errcode);
2640 return JNI_EINVAL;
2641 }
2642 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2643 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2644 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2645 uintx conc_threads = 0;
2646 if (!parse_uintx(tail, &conc_threads, 1)) {
2647 jio_fprintf(defaultStream::error_stream(),
2648 "Invalid concurrent threads: %s\n", option->optionString);
2649 return JNI_EINVAL;
2650 }
2651 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2652 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2653 // Skip -XX:Flags= since that case has already been handled
2654 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2655 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2656 return JNI_EINVAL;
2657 }
2658 }
2659 // Unknown option
2660 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2661 return JNI_ERR;
2662 }
2663 }
2664 // Change the default value for flags which have different default values
2665 // when working with older JDKs.
2666 if (JDK_Version::current().compare_major(6) <= 0 &&
2667 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2668 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2669 }
2670 #ifdef LINUX
2671 if (JDK_Version::current().compare_major(6) <= 0 &&
2672 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2673 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2674 }
2675 #endif // LINUX
2676 return JNI_OK;
2677 }
2678
2679 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2680 // This must be done after all -D arguments have been processed.
2681 scp_p->expand_endorsed();
2682
2683 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2684 // Assemble the bootclasspath elements into the final path.
2685 Arguments::set_sysclasspath(scp_p->combined_path());
2686 }
2687
2688 // This must be done after all arguments have been processed.
2689 // java_compiler() true means set to "NONE" or empty.
2690 if (java_compiler() && !xdebug_mode()) {
2691 // For backwards compatibility, we switch to interpreted mode if
2692 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2693 // not specified.
2694 set_mode_flags(_int);
2695 }
2696 if (CompileThreshold == 0) {
2697 set_mode_flags(_int);
2698 }
2699
2700 #ifndef COMPILER2
2701 // Don't degrade server performance for footprint
2702 if (FLAG_IS_DEFAULT(UseLargePages) &&
2703 MaxHeapSize < LargePageHeapSizeThreshold) {
2704 // No need for large granularity pages w/small heaps.
2705 // Note that large pages are enabled/disabled for both the
2706 // Java heap and the code cache.
2707 FLAG_SET_DEFAULT(UseLargePages, false);
2708 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2709 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2710 }
2711
2712 // Tiered compilation is undefined with C1.
2713 TieredCompilation = false;
2714 #else
2715 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2716 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2717 }
2718 #endif
2719
2720 // If we are running in a headless jre, force java.awt.headless property
2721 // to be true unless the property has already been set.
2722 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2723 if (os::is_headless_jre()) {
2724 const char* headless = Arguments::get_property("java.awt.headless");
2725 if (headless == NULL) {
2726 char envbuffer[128];
2727 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2728 if (!add_property("java.awt.headless=true")) {
2729 return JNI_ENOMEM;
2730 }
2731 } else {
2732 char buffer[256];
2733 strcpy(buffer, "java.awt.headless=");
2734 strcat(buffer, envbuffer);
2735 if (!add_property(buffer)) {
2736 return JNI_ENOMEM;
2737 }
2738 }
2739 }
2740 }
2741
2742 if (!check_vm_args_consistency()) {
2743 return JNI_ERR;
2744 }
2745
2746 return JNI_OK;
2747 }
2748
2749 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2750 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2751 scp_assembly_required_p);
2752 }
2753
2754 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2755 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2756 scp_assembly_required_p);
2757 }
2758
2759 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2760 const int N_MAX_OPTIONS = 64;
2761 const int OPTION_BUFFER_SIZE = 1024;
2762 char buffer[OPTION_BUFFER_SIZE];
2763
2764 // The variable will be ignored if it exceeds the length of the buffer.
2765 // Don't check this variable if user has special privileges
2766 // (e.g. unix su command).
2767 if (os::getenv(name, buffer, sizeof(buffer)) &&
2768 !os::have_special_privileges()) {
2769 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2770 jio_fprintf(defaultStream::error_stream(),
2771 "Picked up %s: %s\n", name, buffer);
2772 char* rd = buffer; // pointer to the input string (rd)
2773 int i;
2774 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2775 while (isspace(*rd)) rd++; // skip whitespace
2776 if (*rd == 0) break; // we re done when the input string is read completely
2777
2778 // The output, option string, overwrites the input string.
2779 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2780 // input string (rd).
2781 char* wrt = rd;
2782
2783 options[i++].optionString = wrt; // Fill in option
2784 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2785 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2786 int quote = *rd; // matching quote to look for
2787 rd++; // don't copy open quote
2788 while (*rd != quote) { // include everything (even spaces) up until quote
2789 if (*rd == 0) { // string termination means unmatched string
2790 jio_fprintf(defaultStream::error_stream(),
2791 "Unmatched quote in %s\n", name);
2792 return JNI_ERR;
2793 }
2794 *wrt++ = *rd++; // copy to option string
2795 }
2796 rd++; // don't copy close quote
2797 } else {
2798 *wrt++ = *rd++; // copy to option string
2799 }
2800 }
2801 // Need to check if we're done before writing a NULL,
2802 // because the write could be to the byte that rd is pointing to.
2803 if (*rd++ == 0) {
2804 *wrt = 0;
2805 break;
2806 }
2807 *wrt = 0; // Zero terminate option
2808 }
2809 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2810 JavaVMInitArgs vm_args;
2811 vm_args.version = JNI_VERSION_1_2;
2812 vm_args.options = options;
2813 vm_args.nOptions = i;
2814 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2815
2816 if (PrintVMOptions) {
2817 const char* tail;
2818 for (int i = 0; i < vm_args.nOptions; i++) {
2819 const JavaVMOption *option = vm_args.options + i;
2820 if (match_option(option, "-XX:", &tail)) {
2821 logOption(tail);
2822 }
2823 }
2824 }
2825
2826 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2827 }
2828 return JNI_OK;
2829 }
2830
2831 void Arguments::set_shared_spaces_flags() {
2832 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2833 const bool might_share = must_share || UseSharedSpaces;
2834
2835 // The string table is part of the shared archive so the size must match.
2836 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2837 // Disable sharing.
2838 if (must_share) {
2839 warning("disabling shared archive %s because of non-default "
2840 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2841 }
2842 if (might_share) {
2843 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2844 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2845 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2846 }
2847 return;
2848 }
2849
2850 // Check whether class data sharing settings conflict with GC, compressed oops
2851 // or page size, and fix them up. Explicit sharing options override other
2852 // settings.
2853 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2854 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2855 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2856 if (cannot_share) {
2857 if (must_share) {
2858 warning("selecting serial gc and disabling large pages %s"
2859 "because of %s", "" LP64_ONLY("and compressed oops "),
2860 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2861 force_serial_gc();
2862 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2863 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2864 } else {
2865 if (UseSharedSpaces && Verbose) {
2866 warning("turning off use of shared archive because of "
2867 "choice of garbage collector or large pages");
2868 }
2869 no_shared_spaces();
2870 }
2871 } else if (UseLargePages && might_share) {
2872 // Disable large pages to allow shared spaces. This is sub-optimal, since
2873 // there may not even be a shared archive to use.
2874 FLAG_SET_DEFAULT(UseLargePages, false);
2875 }
2876 }
2877
2878 // Parse entry point called from JNI_CreateJavaVM
2879
2880 jint Arguments::parse(const JavaVMInitArgs* args) {
2881
2882 // Sharing support
2883 // Construct the path to the archive
2884 char jvm_path[JVM_MAXPATHLEN];
2885 os::jvm_path(jvm_path, sizeof(jvm_path));
2886 #ifdef TIERED
2887 if (strstr(jvm_path, "client") != NULL) {
2888 force_client_mode = true;
2889 }
2890 #endif // TIERED
2891 char *end = strrchr(jvm_path, *os::file_separator());
2892 if (end != NULL) *end = '\0';
2893 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2894 strlen(os::file_separator()) + 20);
2895 if (shared_archive_path == NULL) return JNI_ENOMEM;
2896 strcpy(shared_archive_path, jvm_path);
2897 strcat(shared_archive_path, os::file_separator());
2898 strcat(shared_archive_path, "classes");
2899 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2900 strcat(shared_archive_path, ".jsa");
2901 SharedArchivePath = shared_archive_path;
2902
2903 // Remaining part of option string
2904 const char* tail;
2905
2906 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2907 bool settings_file_specified = false;
2908 const char* flags_file;
2909 int index;
2910 for (index = 0; index < args->nOptions; index++) {
2911 const JavaVMOption *option = args->options + index;
2912 if (match_option(option, "-XX:Flags=", &tail)) {
2913 flags_file = tail;
2914 settings_file_specified = true;
2915 }
2916 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2917 PrintVMOptions = true;
2918 }
2919 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2920 PrintVMOptions = false;
2921 }
2922 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2923 IgnoreUnrecognizedVMOptions = true;
2924 }
2925 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2926 IgnoreUnrecognizedVMOptions = false;
2927 }
2928 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2929 CommandLineFlags::printFlags();
2930 vm_exit(0);
2931 }
2932
2933 #ifndef PRODUCT
2934 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2935 CommandLineFlags::printFlags(true);
2936 vm_exit(0);
2937 }
2938 #endif
2939 }
2940
2941 if (IgnoreUnrecognizedVMOptions) {
2942 // uncast const to modify the flag args->ignoreUnrecognized
2943 *(jboolean*)(&args->ignoreUnrecognized) = true;
2944 }
2945
2946 // Parse specified settings file
2947 if (settings_file_specified) {
2948 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2949 return JNI_EINVAL;
2950 }
2951 }
2952
2953 // Parse default .hotspotrc settings file
2954 if (!settings_file_specified) {
2955 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2956 return JNI_EINVAL;
2957 }
2958 }
2959
2960 if (PrintVMOptions) {
2961 for (index = 0; index < args->nOptions; index++) {
2962 const JavaVMOption *option = args->options + index;
2963 if (match_option(option, "-XX:", &tail)) {
2964 logOption(tail);
2965 }
2966 }
2967 }
2968
2969 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2970 jint result = parse_vm_init_args(args);
2971 if (result != JNI_OK) {
2972 return result;
2973 }
2974
2975 #ifndef PRODUCT
2976 if (TraceBytecodesAt != 0) {
2977 TraceBytecodes = true;
2978 }
2979 if (CountCompiledCalls) {
2980 if (UseCounterDecay) {
2981 warning("UseCounterDecay disabled because CountCalls is set");
2982 UseCounterDecay = false;
2983 }
2984 }
2985 #endif // PRODUCT
2986
2987 // Transitional
2988 if (EnableMethodHandles || AnonymousClasses) {
2989 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
2990 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
2991 } else {
2992 EnableInvokeDynamic = true;
2993 }
2994 }
2995
2996 // JSR 292 is not supported before 1.7
2997 if (!JDK_Version::is_gte_jdk17x_version()) {
2998 if (EnableInvokeDynamic) {
2999 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3000 warning("JSR 292 is not supported before 1.7. Disabling support.");
3001 }
3002 EnableInvokeDynamic = false;
3003 }
3004 }
3005
3006 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3007 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3008 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3009 }
3010 ScavengeRootsInCode = 1;
3011 }
3012 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3013 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3014 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3015 }
3016 ScavengeRootsInCode = 1;
3017 }
3018
3019 if (PrintGCDetails) {
3020 // Turn on -verbose:gc options as well
3021 PrintGC = true;
3022 }
3023
3024 // Set object alignment values.
3025 set_object_alignment();
3026
3027 #ifdef SERIALGC
3028 force_serial_gc();
3029 #endif // SERIALGC
3030 #ifdef KERNEL
3031 no_shared_spaces();
3032 #endif // KERNEL
3033
3034 // Set flags based on ergonomics.
3035 set_ergonomics_flags();
3036
3037 set_shared_spaces_flags();
3038
3039 // Check the GC selections again.
3040 if (!check_gc_consistency()) {
3041 return JNI_EINVAL;
3042 }
3043
3044 if (TieredCompilation) {
3045 set_tiered_flags();
3046 } else {
3047 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3048 if (CompilationPolicyChoice >= 2) {
3049 vm_exit_during_initialization(
3050 "Incompatible compilation policy selected", NULL);
3051 }
3052 }
3053
3054 #ifndef KERNEL
3055 // Set heap size based on available physical memory
3056 set_heap_size();
3057 // Set per-collector flags
3058 if (UseParallelGC || UseParallelOldGC) {
3059 set_parallel_gc_flags();
3060 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3061 set_cms_and_parnew_gc_flags();
3062 } else if (UseParNewGC) { // skipped if CMS is set above
3063 set_parnew_gc_flags();
3064 } else if (UseG1GC) {
3065 set_g1_gc_flags();
3066 }
3067 #endif // KERNEL
3068
3069 #ifdef SERIALGC
3070 assert(verify_serial_gc_flags(), "SerialGC unset");
3071 #endif // SERIALGC
3072
3073 // Set bytecode rewriting flags
3074 set_bytecode_flags();
3075
3076 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3077 set_aggressive_opts_flags();
3078
3079 // Turn off biased locking for locking debug mode flags,
3080 // which are subtlely different from each other but neither works with
3081 // biased locking.
3082 if (UseHeavyMonitors
3083 #ifdef COMPILER1
3084 || !UseFastLocking
3085 #endif // COMPILER1
3086 ) {
3087 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3088 // flag set to true on command line; warn the user that they
3089 // can't enable biased locking here
3090 warning("Biased Locking is not supported with locking debug flags"
3091 "; ignoring UseBiasedLocking flag." );
3092 }
3093 UseBiasedLocking = false;
3094 }
3095
3096 #ifdef CC_INTERP
3097 // Clear flags not supported by the C++ interpreter
3098 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3099 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3100 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3101 #endif // CC_INTERP
3102
3103 #ifdef COMPILER2
3104 if (!UseBiasedLocking || EmitSync != 0) {
3105 UseOptoBiasInlining = false;
3106 }
3107 #endif
3108
3109 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3110 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3111 DebugNonSafepoints = true;
3112 }
3113
3114 #ifndef PRODUCT
3115 if (CompileTheWorld) {
3116 // Force NmethodSweeper to sweep whole CodeCache each time.
3117 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3118 NmethodSweepFraction = 1;
3119 }
3120 }
3121 #endif
3122
3123 if (PrintCommandLineFlags) {
3124 CommandLineFlags::printSetFlags();
3125 }
3126
3127 // Apply CPU specific policy for the BiasedLocking
3128 if (UseBiasedLocking) {
3129 if (!VM_Version::use_biased_locking() &&
3130 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3131 UseBiasedLocking = false;
3132 }
3133 }
3134
3135 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3136 // but only if not already set on the commandline
3137 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3138 bool set = false;
3139 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3140 if (!set) {
3141 FLAG_SET_DEFAULT(PauseAtExit, true);
3142 }
3143 }
3144
3145 return JNI_OK;
3146 }
3147
3148 int Arguments::PropertyList_count(SystemProperty* pl) {
3149 int count = 0;
3150 while(pl != NULL) {
3151 count++;
3152 pl = pl->next();
3153 }
3154 return count;
3155 }
3156
3157 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3158 assert(key != NULL, "just checking");
3159 SystemProperty* prop;
3160 for (prop = pl; prop != NULL; prop = prop->next()) {
3161 if (strcmp(key, prop->key()) == 0) return prop->value();
3162 }
3163 return NULL;
3164 }
3165
3166 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3167 int count = 0;
3168 const char* ret_val = NULL;
3169
3170 while(pl != NULL) {
3171 if(count >= index) {
3172 ret_val = pl->key();
3173 break;
3174 }
3175 count++;
3176 pl = pl->next();
3177 }
3178
3179 return ret_val;
3180 }
3181
3182 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3183 int count = 0;
3184 char* ret_val = NULL;
3185
3186 while(pl != NULL) {
3187 if(count >= index) {
3188 ret_val = pl->value();
3189 break;
3190 }
3191 count++;
3192 pl = pl->next();
3193 }
3194
3195 return ret_val;
3196 }
3197
3198 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3199 SystemProperty* p = *plist;
3200 if (p == NULL) {
3201 *plist = new_p;
3202 } else {
3203 while (p->next() != NULL) {
3204 p = p->next();
3205 }
3206 p->set_next(new_p);
3207 }
3208 }
3209
3210 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3211 if (plist == NULL)
3212 return;
3213
3214 SystemProperty* new_p = new SystemProperty(k, v, true);
3215 PropertyList_add(plist, new_p);
3216 }
3217
3218 // This add maintains unique property key in the list.
3219 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3220 if (plist == NULL)
3221 return;
3222
3223 // If property key exist then update with new value.
3224 SystemProperty* prop;
3225 for (prop = *plist; prop != NULL; prop = prop->next()) {
3226 if (strcmp(k, prop->key()) == 0) {
3227 if (append) {
3228 prop->append_value(v);
3229 } else {
3230 prop->set_value(v);
3231 }
3232 return;
3233 }
3234 }
3235
3236 PropertyList_add(plist, k, v);
3237 }
3238
3239 #ifdef KERNEL
3240 char *Arguments::get_kernel_properties() {
3241 // Find properties starting with kernel and append them to string
3242 // We need to find out how long they are first because the URL's that they
3243 // might point to could get long.
3244 int length = 0;
3245 SystemProperty* prop;
3246 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3247 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3248 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3249 }
3250 }
3251 // Add one for null terminator.
3252 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3253 if (length != 0) {
3254 int pos = 0;
3255 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3256 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3257 jio_snprintf(&props[pos], length-pos,
3258 "-D%s=%s ", prop->key(), prop->value());
3259 pos = strlen(props);
3260 }
3261 }
3262 }
3263 // null terminate props in case of null
3264 props[length] = '\0';
3265 return props;
3266 }
3267 #endif // KERNEL
3268
3269 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3270 // Returns true if all of the source pointed by src has been copied over to
3271 // the destination buffer pointed by buf. Otherwise, returns false.
3272 // Notes:
3273 // 1. If the length (buflen) of the destination buffer excluding the
3274 // NULL terminator character is not long enough for holding the expanded
3275 // pid characters, it also returns false instead of returning the partially
3276 // expanded one.
3277 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3278 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3279 char* buf, size_t buflen) {
3280 const char* p = src;
3281 char* b = buf;
3282 const char* src_end = &src[srclen];
3283 char* buf_end = &buf[buflen - 1];
3284
3285 while (p < src_end && b < buf_end) {
3286 if (*p == '%') {
3287 switch (*(++p)) {
3288 case '%': // "%%" ==> "%"
3289 *b++ = *p++;
3290 break;
3291 case 'p': { // "%p" ==> current process id
3292 // buf_end points to the character before the last character so
3293 // that we could write '\0' to the end of the buffer.
3294 size_t buf_sz = buf_end - b + 1;
3295 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3296
3297 // if jio_snprintf fails or the buffer is not long enough to hold
3298 // the expanded pid, returns false.
3299 if (ret < 0 || ret >= (int)buf_sz) {
3300 return false;
3301 } else {
3302 b += ret;
3303 assert(*b == '\0', "fail in copy_expand_pid");
3304 if (p == src_end && b == buf_end + 1) {
3305 // reach the end of the buffer.
3306 return true;
3307 }
3308 }
3309 p++;
3310 break;
3311 }
3312 default :
3313 *b++ = '%';
3314 }
3315 } else {
3316 *b++ = *p++;
3317 }
3318 }
3319 *b = '\0';
3320 return (p == src_end); // return false if not all of the source was copied
3321 }