1 /*
2 * Copyright (c) 1997, 2013, 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 "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/referenceProcessor.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "runtime/java.hpp"
38 #include "services/management.hpp"
39 #include "services/memTracker.hpp"
40 #include "utilities/defaultStream.hpp"
41 #include "utilities/macros.hpp"
42 #include "utilities/taskqueue.hpp"
43 #ifdef TARGET_OS_FAMILY_linux
44 # include "os_linux.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_solaris
47 # include "os_solaris.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_windows
50 # include "os_windows.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_bsd
53 # include "os_bsd.inline.hpp"
54 #endif
55 #if INCLUDE_ALL_GCS
56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
57 #endif // INCLUDE_ALL_GCS
58
59 // Note: This is a special bug reporting site for the JVM
60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
61 #define DEFAULT_JAVA_LAUNCHER "generic"
62
63 char** Arguments::_jvm_flags_array = NULL;
64 int Arguments::_num_jvm_flags = 0;
65 char** Arguments::_jvm_args_array = NULL;
66 int Arguments::_num_jvm_args = 0;
67 char* Arguments::_java_command = NULL;
68 SystemProperty* Arguments::_system_properties = NULL;
69 const char* Arguments::_gc_log_filename = NULL;
70 bool Arguments::_has_profile = false;
71 bool Arguments::_has_alloc_profile = false;
72 uintx Arguments::_min_heap_size = 0;
73 Arguments::Mode Arguments::_mode = _mixed;
74 bool Arguments::_java_compiler = false;
75 bool Arguments::_xdebug_mode = false;
76 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
77 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
78 int Arguments::_sun_java_launcher_pid = -1;
79 bool Arguments::_created_by_gamma_launcher = false;
80
81 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
84 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
85 bool Arguments::_ClipInlining = ClipInlining;
86
87 char* Arguments::SharedArchivePath = NULL;
88
89 AgentLibraryList Arguments::_libraryList;
90 AgentLibraryList Arguments::_agentList;
91
92 abort_hook_t Arguments::_abort_hook = NULL;
93 exit_hook_t Arguments::_exit_hook = NULL;
94 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
95
96
97 SystemProperty *Arguments::_java_ext_dirs = NULL;
98 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
99 SystemProperty *Arguments::_sun_boot_library_path = NULL;
100 SystemProperty *Arguments::_java_library_path = NULL;
101 SystemProperty *Arguments::_java_home = NULL;
102 SystemProperty *Arguments::_java_class_path = NULL;
103 SystemProperty *Arguments::_sun_boot_class_path = NULL;
104
105 char* Arguments::_meta_index_path = NULL;
106 char* Arguments::_meta_index_dir = NULL;
107
108 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
109
110 static bool match_option(const JavaVMOption *option, const char* name,
111 const char** tail) {
112 int len = (int)strlen(name);
113 if (strncmp(option->optionString, name, len) == 0) {
114 *tail = option->optionString + len;
115 return true;
116 } else {
117 return false;
118 }
119 }
120
121 static void logOption(const char* opt) {
122 if (PrintVMOptions) {
123 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
124 }
125 }
126
127 // Process java launcher properties.
128 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
129 // See if sun.java.launcher or sun.java.launcher.pid is defined.
130 // Must do this before setting up other system properties,
131 // as some of them may depend on launcher type.
132 for (int index = 0; index < args->nOptions; index++) {
133 const JavaVMOption* option = args->options + index;
134 const char* tail;
135
136 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
137 process_java_launcher_argument(tail, option->extraInfo);
138 continue;
139 }
140 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
141 _sun_java_launcher_pid = atoi(tail);
142 continue;
143 }
144 }
145 }
146
147 // Initialize system properties key and value.
148 void Arguments::init_system_properties() {
149
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
151 "Java Virtual Machine Specification", false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
155
156 // following are JVMTI agent writeable properties.
157 // Properties values are set to NULL and they are
158 // os specific they are initialized in os::init_system_properties_values().
159 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
160 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
161 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
162 _java_library_path = new SystemProperty("java.library.path", NULL, true);
163 _java_home = new SystemProperty("java.home", NULL, true);
164 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
165
166 _java_class_path = new SystemProperty("java.class.path", "", true);
167
168 // Add to System Property list.
169 PropertyList_add(&_system_properties, _java_ext_dirs);
170 PropertyList_add(&_system_properties, _java_endorsed_dirs);
171 PropertyList_add(&_system_properties, _sun_boot_library_path);
172 PropertyList_add(&_system_properties, _java_library_path);
173 PropertyList_add(&_system_properties, _java_home);
174 PropertyList_add(&_system_properties, _java_class_path);
175 PropertyList_add(&_system_properties, _sun_boot_class_path);
176
177 // Set OS specific system properties values
178 os::init_system_properties_values();
179 }
180
181
182 // Update/Initialize System properties after JDK version number is known
183 void Arguments::init_version_specific_system_properties() {
184 enum { bufsz = 16 };
185 char buffer[bufsz];
186 const char* spec_vendor = "Sun Microsystems Inc.";
187 uint32_t spec_version = 0;
188
189 if (JDK_Version::is_gte_jdk17x_version()) {
190 spec_vendor = "Oracle Corporation";
191 spec_version = JDK_Version::current().major_version();
192 }
193 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
194
195 PropertyList_add(&_system_properties,
196 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
197 PropertyList_add(&_system_properties,
198 new SystemProperty("java.vm.specification.version", buffer, false));
199 PropertyList_add(&_system_properties,
200 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
201 }
202
203 /**
204 * Provide a slightly more user-friendly way of eliminating -XX flags.
205 * When a flag is eliminated, it can be added to this list in order to
206 * continue accepting this flag on the command-line, while issuing a warning
207 * and ignoring the value. Once the JDK version reaches the 'accept_until'
208 * limit, we flatly refuse to admit the existence of the flag. This allows
209 * a flag to die correctly over JDK releases using HSX.
210 */
211 typedef struct {
212 const char* name;
213 JDK_Version obsoleted_in; // when the flag went away
214 JDK_Version accept_until; // which version to start denying the existence
215 } ObsoleteFlag;
216
217 static ObsoleteFlag obsolete_jvm_flags[] = {
218 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
232 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "DefaultInitialRAMFraction",
234 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
235 { "UseDepthFirstScavengeOrder",
236 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
237 { "HandlePromotionFailure",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "MaxLiveObjectEvacuationRatio",
240 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
241 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
242 { "UseParallelOldGCCompacting",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelDensePrefixUpdate",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "UseParallelOldGCDensePrefix",
247 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
248 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
250 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
264 #ifdef PRODUCT
265 { "DesiredMethodLimit",
266 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
267 #endif // PRODUCT
268 { NULL, JDK_Version(0), JDK_Version(0) }
269 };
270
271 // Returns true if the flag is obsolete and fits into the range specified
272 // for being ignored. In the case that the flag is ignored, the 'version'
273 // value is filled in with the version number when the flag became
274 // obsolete so that that value can be displayed to the user.
275 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
276 int i = 0;
277 assert(version != NULL, "Must provide a version buffer");
278 while (obsolete_jvm_flags[i].name != NULL) {
279 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
280 // <flag>=xxx form
281 // [-|+]<flag> form
282 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
283 ((s[0] == '+' || s[0] == '-') &&
284 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
285 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
286 *version = flag_status.obsoleted_in;
287 return true;
288 }
289 }
290 i++;
291 }
292 return false;
293 }
294
295 // Constructs the system class path (aka boot class path) from the following
296 // components, in order:
297 //
298 // prefix // from -Xbootclasspath/p:...
299 // endorsed // the expansion of -Djava.endorsed.dirs=...
300 // base // from os::get_system_properties() or -Xbootclasspath=
301 // suffix // from -Xbootclasspath/a:...
302 //
303 // java.endorsed.dirs is a list of directories; any jar or zip files in the
304 // directories are added to the sysclasspath just before the base.
305 //
306 // This could be AllStatic, but it isn't needed after argument processing is
307 // complete.
308 class SysClassPath: public StackObj {
309 public:
310 SysClassPath(const char* base);
311 ~SysClassPath();
312
313 inline void set_base(const char* base);
314 inline void add_prefix(const char* prefix);
315 inline void add_suffix_to_prefix(const char* suffix);
316 inline void add_suffix(const char* suffix);
317 inline void reset_path(const char* base);
318
319 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
320 // property. Must be called after all command-line arguments have been
321 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
322 // combined_path().
323 void expand_endorsed();
324
325 inline const char* get_base() const { return _items[_scp_base]; }
326 inline const char* get_prefix() const { return _items[_scp_prefix]; }
327 inline const char* get_suffix() const { return _items[_scp_suffix]; }
328 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
329
330 // Combine all the components into a single c-heap-allocated string; caller
331 // must free the string if/when no longer needed.
332 char* combined_path();
333
334 private:
335 // Utility routines.
336 static char* add_to_path(const char* path, const char* str, bool prepend);
337 static char* add_jars_to_path(char* path, const char* directory);
338
339 inline void reset_item_at(int index);
340
341 // Array indices for the items that make up the sysclasspath. All except the
342 // base are allocated in the C heap and freed by this class.
343 enum {
344 _scp_prefix, // from -Xbootclasspath/p:...
345 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
346 _scp_base, // the default sysclasspath
347 _scp_suffix, // from -Xbootclasspath/a:...
348 _scp_nitems // the number of items, must be last.
349 };
350
351 const char* _items[_scp_nitems];
352 DEBUG_ONLY(bool _expansion_done;)
353 };
354
355 SysClassPath::SysClassPath(const char* base) {
356 memset(_items, 0, sizeof(_items));
357 _items[_scp_base] = base;
358 DEBUG_ONLY(_expansion_done = false;)
359 }
360
361 SysClassPath::~SysClassPath() {
362 // Free everything except the base.
363 for (int i = 0; i < _scp_nitems; ++i) {
364 if (i != _scp_base) reset_item_at(i);
365 }
366 DEBUG_ONLY(_expansion_done = false;)
367 }
368
369 inline void SysClassPath::set_base(const char* base) {
370 _items[_scp_base] = base;
371 }
372
373 inline void SysClassPath::add_prefix(const char* prefix) {
374 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
375 }
376
377 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
378 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
379 }
380
381 inline void SysClassPath::add_suffix(const char* suffix) {
382 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
383 }
384
385 inline void SysClassPath::reset_item_at(int index) {
386 assert(index < _scp_nitems && index != _scp_base, "just checking");
387 if (_items[index] != NULL) {
388 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
389 _items[index] = NULL;
390 }
391 }
392
393 inline void SysClassPath::reset_path(const char* base) {
394 // Clear the prefix and suffix.
395 reset_item_at(_scp_prefix);
396 reset_item_at(_scp_suffix);
397 set_base(base);
398 }
399
400 //------------------------------------------------------------------------------
401
402 void SysClassPath::expand_endorsed() {
403 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
404
405 const char* path = Arguments::get_property("java.endorsed.dirs");
406 if (path == NULL) {
407 path = Arguments::get_endorsed_dir();
408 assert(path != NULL, "no default for java.endorsed.dirs");
409 }
410
411 char* expanded_path = NULL;
412 const char separator = *os::path_separator();
413 const char* const end = path + strlen(path);
414 while (path < end) {
415 const char* tmp_end = strchr(path, separator);
416 if (tmp_end == NULL) {
417 expanded_path = add_jars_to_path(expanded_path, path);
418 path = end;
419 } else {
420 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
421 memcpy(dirpath, path, tmp_end - path);
422 dirpath[tmp_end - path] = '\0';
423 expanded_path = add_jars_to_path(expanded_path, dirpath);
424 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
425 path = tmp_end + 1;
426 }
427 }
428 _items[_scp_endorsed] = expanded_path;
429 DEBUG_ONLY(_expansion_done = true;)
430 }
431
432 // Combine the bootclasspath elements, some of which may be null, into a single
433 // c-heap-allocated string.
434 char* SysClassPath::combined_path() {
435 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
436 assert(_expansion_done, "must call expand_endorsed() first.");
437
438 size_t lengths[_scp_nitems];
439 size_t total_len = 0;
440
441 const char separator = *os::path_separator();
442
443 // Get the lengths.
444 int i;
445 for (i = 0; i < _scp_nitems; ++i) {
446 if (_items[i] != NULL) {
447 lengths[i] = strlen(_items[i]);
448 // Include space for the separator char (or a NULL for the last item).
449 total_len += lengths[i] + 1;
450 }
451 }
452 assert(total_len > 0, "empty sysclasspath not allowed");
453
454 // Copy the _items to a single string.
455 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
456 char* cp_tmp = cp;
457 for (i = 0; i < _scp_nitems; ++i) {
458 if (_items[i] != NULL) {
459 memcpy(cp_tmp, _items[i], lengths[i]);
460 cp_tmp += lengths[i];
461 *cp_tmp++ = separator;
462 }
463 }
464 *--cp_tmp = '\0'; // Replace the extra separator.
465 return cp;
466 }
467
468 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
469 char*
470 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
471 char *cp;
472
473 assert(str != NULL, "just checking");
474 if (path == NULL) {
475 size_t len = strlen(str) + 1;
476 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
477 memcpy(cp, str, len); // copy the trailing null
478 } else {
479 const char separator = *os::path_separator();
480 size_t old_len = strlen(path);
481 size_t str_len = strlen(str);
482 size_t len = old_len + str_len + 2;
483
484 if (prepend) {
485 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
486 char* cp_tmp = cp;
487 memcpy(cp_tmp, str, str_len);
488 cp_tmp += str_len;
489 *cp_tmp = separator;
490 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
491 FREE_C_HEAP_ARRAY(char, path, mtInternal);
492 } else {
493 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
494 char* cp_tmp = cp + old_len;
495 *cp_tmp = separator;
496 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
497 }
498 }
499 return cp;
500 }
501
502 // Scan the directory and append any jar or zip files found to path.
503 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
504 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
505 DIR* dir = os::opendir(directory);
506 if (dir == NULL) return path;
507
508 char dir_sep[2] = { '\0', '\0' };
509 size_t directory_len = strlen(directory);
510 const char fileSep = *os::file_separator();
511 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
512
513 /* Scan the directory for jars/zips, appending them to path. */
514 struct dirent *entry;
515 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
516 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
517 const char* name = entry->d_name;
518 const char* ext = name + strlen(name) - 4;
519 bool isJarOrZip = ext > name &&
520 (os::file_name_strcmp(ext, ".jar") == 0 ||
521 os::file_name_strcmp(ext, ".zip") == 0);
522 if (isJarOrZip) {
523 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
524 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
525 path = add_to_path(path, jarpath, false);
526 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
527 }
528 }
529 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
530 os::closedir(dir);
531 return path;
532 }
533
534 // Parses a memory size specification string.
535 static bool atomull(const char *s, julong* result) {
536 julong n = 0;
537 int args_read = sscanf(s, JULONG_FORMAT, &n);
538 if (args_read != 1) {
539 return false;
540 }
541 while (*s != '\0' && isdigit(*s)) {
542 s++;
543 }
544 // 4705540: illegal if more characters are found after the first non-digit
545 if (strlen(s) > 1) {
546 return false;
547 }
548 switch (*s) {
549 case 'T': case 't':
550 *result = n * G * K;
551 // Check for overflow.
552 if (*result/((julong)G * K) != n) return false;
553 return true;
554 case 'G': case 'g':
555 *result = n * G;
556 if (*result/G != n) return false;
557 return true;
558 case 'M': case 'm':
559 *result = n * M;
560 if (*result/M != n) return false;
561 return true;
562 case 'K': case 'k':
563 *result = n * K;
564 if (*result/K != n) return false;
565 return true;
566 case '\0':
567 *result = n;
568 return true;
569 default:
570 return false;
571 }
572 }
573
574 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
575 if (size < min_size) return arg_too_small;
576 // Check that size will fit in a size_t (only relevant on 32-bit)
577 if (size > max_uintx) return arg_too_big;
578 return arg_in_range;
579 }
580
581 // Describe an argument out of range error
582 void Arguments::describe_range_error(ArgsRange errcode) {
583 switch(errcode) {
584 case arg_too_big:
585 jio_fprintf(defaultStream::error_stream(),
586 "The specified size exceeds the maximum "
587 "representable size.\n");
588 break;
589 case arg_too_small:
590 case arg_unreadable:
591 case arg_in_range:
592 // do nothing for now
593 break;
594 default:
595 ShouldNotReachHere();
596 }
597 }
598
599 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
600 return CommandLineFlags::boolAtPut(name, &value, origin);
601 }
602
603 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
604 double v;
605 if (sscanf(value, "%lf", &v) != 1) {
606 return false;
607 }
608
609 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
610 return true;
611 }
612 return false;
613 }
614
615 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
616 julong v;
617 intx intx_v;
618 bool is_neg = false;
619 // Check the sign first since atomull() parses only unsigned values.
620 if (*value == '-') {
621 if (!CommandLineFlags::intxAt(name, &intx_v)) {
622 return false;
623 }
624 value++;
625 is_neg = true;
626 }
627 if (!atomull(value, &v)) {
628 return false;
629 }
630 intx_v = (intx) v;
631 if (is_neg) {
632 intx_v = -intx_v;
633 }
634 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
635 return true;
636 }
637 uintx uintx_v = (uintx) v;
638 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
639 return true;
640 }
641 uint64_t uint64_t_v = (uint64_t) v;
642 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
643 return true;
644 }
645 return false;
646 }
647
648 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
649 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
650 // Contract: CommandLineFlags always returns a pointer that needs freeing.
651 FREE_C_HEAP_ARRAY(char, value, mtInternal);
652 return true;
653 }
654
655 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
656 const char* old_value = "";
657 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
658 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
659 size_t new_len = strlen(new_value);
660 const char* value;
661 char* free_this_too = NULL;
662 if (old_len == 0) {
663 value = new_value;
664 } else if (new_len == 0) {
665 value = old_value;
666 } else {
667 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
668 // each new setting adds another LINE to the switch:
669 sprintf(buf, "%s\n%s", old_value, new_value);
670 value = buf;
671 free_this_too = buf;
672 }
673 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
674 // CommandLineFlags always returns a pointer that needs freeing.
675 FREE_C_HEAP_ARRAY(char, value, mtInternal);
676 if (free_this_too != NULL) {
677 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
678 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
679 }
680 return true;
681 }
682
683 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
684
685 // range of acceptable characters spelled out for portability reasons
686 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
687 #define BUFLEN 255
688 char name[BUFLEN+1];
689 char dummy;
690
691 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
692 return set_bool_flag(name, false, origin);
693 }
694 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
695 return set_bool_flag(name, true, origin);
696 }
697
698 char punct;
699 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
700 const char* value = strchr(arg, '=') + 1;
701 Flag* flag = Flag::find_flag(name, strlen(name));
702 if (flag != NULL && flag->is_ccstr()) {
703 if (flag->ccstr_accumulates()) {
704 return append_to_string_flag(name, value, origin);
705 } else {
706 if (value[0] == '\0') {
707 value = NULL;
708 }
709 return set_string_flag(name, value, origin);
710 }
711 }
712 }
713
714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
715 const char* value = strchr(arg, '=') + 1;
716 // -XX:Foo:=xxx will reset the string flag to the given value.
717 if (value[0] == '\0') {
718 value = NULL;
719 }
720 return set_string_flag(name, value, origin);
721 }
722
723 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
724 #define SIGNED_NUMBER_RANGE "[-0123456789]"
725 #define NUMBER_RANGE "[0123456789]"
726 char value[BUFLEN + 1];
727 char value2[BUFLEN + 1];
728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
729 // Looks like a floating-point number -- try again with more lenient format string
730 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
731 return set_fp_numeric_flag(name, value, origin);
732 }
733 }
734
735 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
736 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
737 return set_numeric_flag(name, value, origin);
738 }
739
740 return false;
741 }
742
743 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
744 assert(bldarray != NULL, "illegal argument");
745
746 if (arg == NULL) {
747 return;
748 }
749
750 int new_count = *count + 1;
751
752 // expand the array and add arg to the last element
753 if (*bldarray == NULL) {
754 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
755 } else {
756 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
757 }
758 (*bldarray)[*count] = strdup(arg);
759 *count = new_count;
760 }
761
762 void Arguments::build_jvm_args(const char* arg) {
763 add_string(&_jvm_args_array, &_num_jvm_args, arg);
764 }
765
766 void Arguments::build_jvm_flags(const char* arg) {
767 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
768 }
769
770 // utility function to return a string that concatenates all
771 // strings in a given char** array
772 const char* Arguments::build_resource_string(char** args, int count) {
773 if (args == NULL || count == 0) {
774 return NULL;
775 }
776 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
777 for (int i = 1; i < count; i++) {
778 length += strlen(args[i]) + 1; // add 1 for a space
779 }
780 char* s = NEW_RESOURCE_ARRAY(char, length);
781 strcpy(s, args[0]);
782 for (int j = 1; j < count; j++) {
783 strcat(s, " ");
784 strcat(s, args[j]);
785 }
786 return (const char*) s;
787 }
788
789 void Arguments::print_on(outputStream* st) {
790 st->print_cr("VM Arguments:");
791 if (num_jvm_flags() > 0) {
792 st->print("jvm_flags: "); print_jvm_flags_on(st);
793 }
794 if (num_jvm_args() > 0) {
795 st->print("jvm_args: "); print_jvm_args_on(st);
796 }
797 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
798 if (_java_class_path != NULL) {
799 char* path = _java_class_path->value();
800 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
801 }
802 st->print_cr("Launcher Type: %s", _sun_java_launcher);
803 }
804
805 void Arguments::print_jvm_flags_on(outputStream* st) {
806 if (_num_jvm_flags > 0) {
807 for (int i=0; i < _num_jvm_flags; i++) {
808 st->print("%s ", _jvm_flags_array[i]);
809 }
810 st->print_cr("");
811 }
812 }
813
814 void Arguments::print_jvm_args_on(outputStream* st) {
815 if (_num_jvm_args > 0) {
816 for (int i=0; i < _num_jvm_args; i++) {
817 st->print("%s ", _jvm_args_array[i]);
818 }
819 st->print_cr("");
820 }
821 }
822
823 bool Arguments::process_argument(const char* arg,
824 jboolean ignore_unrecognized, FlagValueOrigin origin) {
825
826 JDK_Version since = JDK_Version();
827
828 if (parse_argument(arg, origin) || ignore_unrecognized) {
829 return true;
830 }
831
832 bool has_plus_minus = (*arg == '+' || *arg == '-');
833 const char* const argname = has_plus_minus ? arg + 1 : arg;
834 if (is_newly_obsolete(arg, &since)) {
835 char version[256];
836 since.to_string(version, sizeof(version));
837 warning("ignoring option %s; support was removed in %s", argname, version);
838 return true;
839 }
840
841 // For locked flags, report a custom error message if available.
842 // Otherwise, report the standard unrecognized VM option.
843
844 size_t arg_len;
845 const char* equal_sign = strchr(argname, '=');
846 if (equal_sign == NULL) {
847 arg_len = strlen(argname);
848 } else {
849 arg_len = equal_sign - argname;
850 }
851
852 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true);
853 if (found_flag != NULL) {
854 char locked_message_buf[BUFLEN];
855 found_flag->get_locked_message(locked_message_buf, BUFLEN);
856 if (strlen(locked_message_buf) == 0) {
857 if (found_flag->is_bool() && !has_plus_minus) {
858 jio_fprintf(defaultStream::error_stream(),
859 "Missing +/- setting for VM option '%s'\n", argname);
860 } else if (!found_flag->is_bool() && has_plus_minus) {
861 jio_fprintf(defaultStream::error_stream(),
862 "Unexpected +/- setting in VM option '%s'\n", argname);
863 } else {
864 jio_fprintf(defaultStream::error_stream(),
865 "Improperly specified VM option '%s'\n", argname);
866 }
867 } else {
868 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
869 }
870 } else {
871 jio_fprintf(defaultStream::error_stream(),
872 "Unrecognized VM option '%s'\n", argname);
873 }
874
875 // allow for commandline "commenting out" options like -XX:#+Verbose
876 return arg[0] == '#';
877 }
878
879 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
880 FILE* stream = fopen(file_name, "rb");
881 if (stream == NULL) {
882 if (should_exist) {
883 jio_fprintf(defaultStream::error_stream(),
884 "Could not open settings file %s\n", file_name);
885 return false;
886 } else {
887 return true;
888 }
889 }
890
891 char token[1024];
892 int pos = 0;
893
894 bool in_white_space = true;
895 bool in_comment = false;
896 bool in_quote = false;
897 char quote_c = 0;
898 bool result = true;
899
900 int c = getc(stream);
901 while(c != EOF && pos < (int)(sizeof(token)-1)) {
902 if (in_white_space) {
903 if (in_comment) {
904 if (c == '\n') in_comment = false;
905 } else {
906 if (c == '#') in_comment = true;
907 else if (!isspace(c)) {
908 in_white_space = false;
909 token[pos++] = c;
910 }
911 }
912 } else {
913 if (c == '\n' || (!in_quote && isspace(c))) {
914 // token ends at newline, or at unquoted whitespace
915 // this allows a way to include spaces in string-valued options
916 token[pos] = '\0';
917 logOption(token);
918 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
919 build_jvm_flags(token);
920 pos = 0;
921 in_white_space = true;
922 in_quote = false;
923 } else if (!in_quote && (c == '\'' || c == '"')) {
924 in_quote = true;
925 quote_c = c;
926 } else if (in_quote && (c == quote_c)) {
927 in_quote = false;
928 } else {
929 token[pos++] = c;
930 }
931 }
932 c = getc(stream);
933 }
934 if (pos > 0) {
935 token[pos] = '\0';
936 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
937 build_jvm_flags(token);
938 }
939 fclose(stream);
940 return result;
941 }
942
943 //=============================================================================================================
944 // Parsing of properties (-D)
945
946 const char* Arguments::get_property(const char* key) {
947 return PropertyList_get_value(system_properties(), key);
948 }
949
950 bool Arguments::add_property(const char* prop) {
951 const char* eq = strchr(prop, '=');
952 char* key;
953 // ns must be static--its address may be stored in a SystemProperty object.
954 const static char ns[1] = {0};
955 char* value = (char *)ns;
956
957 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
958 key = AllocateHeap(key_len + 1, mtInternal);
959 strncpy(key, prop, key_len);
960 key[key_len] = '\0';
961
962 if (eq != NULL) {
963 size_t value_len = strlen(prop) - key_len - 1;
964 value = AllocateHeap(value_len + 1, mtInternal);
965 strncpy(value, &prop[key_len + 1], value_len + 1);
966 }
967
968 if (strcmp(key, "java.compiler") == 0) {
969 process_java_compiler_argument(value);
970 FreeHeap(key);
971 if (eq != NULL) {
972 FreeHeap(value);
973 }
974 return true;
975 } else if (strcmp(key, "sun.java.command") == 0) {
976 _java_command = value;
977
978 // Record value in Arguments, but let it get passed to Java.
979 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
980 // launcher.pid property is private and is processed
981 // in process_sun_java_launcher_properties();
982 // the sun.java.launcher property is passed on to the java application
983 FreeHeap(key);
984 if (eq != NULL) {
985 FreeHeap(value);
986 }
987 return true;
988 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
989 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
990 // its value without going through the property list or making a Java call.
991 _java_vendor_url_bug = value;
992 } else if (strcmp(key, "sun.boot.library.path") == 0) {
993 PropertyList_unique_add(&_system_properties, key, value, true);
994 return true;
995 }
996 // Create new property and add at the end of the list
997 PropertyList_unique_add(&_system_properties, key, value);
998 return true;
999 }
1000
1001 //===========================================================================================================
1002 // Setting int/mixed/comp mode flags
1003
1004 void Arguments::set_mode_flags(Mode mode) {
1005 // Set up default values for all flags.
1006 // If you add a flag to any of the branches below,
1007 // add a default value for it here.
1008 set_java_compiler(false);
1009 _mode = mode;
1010
1011 // Ensure Agent_OnLoad has the correct initial values.
1012 // This may not be the final mode; mode may change later in onload phase.
1013 PropertyList_unique_add(&_system_properties, "java.vm.info",
1014 (char*)VM_Version::vm_info_string(), false);
1015
1016 UseInterpreter = true;
1017 UseCompiler = true;
1018 UseLoopCounter = true;
1019
1020 #ifndef ZERO
1021 // Turn these off for mixed and comp. Leave them on for Zero.
1022 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1023 UseFastAccessorMethods = (mode == _int);
1024 }
1025 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1026 UseFastEmptyMethods = (mode == _int);
1027 }
1028 #endif
1029
1030 // Default values may be platform/compiler dependent -
1031 // use the saved values
1032 ClipInlining = Arguments::_ClipInlining;
1033 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1034 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1035 BackgroundCompilation = Arguments::_BackgroundCompilation;
1036
1037 // Change from defaults based on mode
1038 switch (mode) {
1039 default:
1040 ShouldNotReachHere();
1041 break;
1042 case _int:
1043 UseCompiler = false;
1044 UseLoopCounter = false;
1045 AlwaysCompileLoopMethods = false;
1046 UseOnStackReplacement = false;
1047 break;
1048 case _mixed:
1049 // same as default
1050 break;
1051 case _comp:
1052 UseInterpreter = false;
1053 BackgroundCompilation = false;
1054 ClipInlining = false;
1055 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1056 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1057 // compile a level 4 (C2) and then continue executing it.
1058 if (TieredCompilation) {
1059 Tier3InvokeNotifyFreqLog = 0;
1060 Tier4InvocationThreshold = 0;
1061 }
1062 break;
1063 }
1064 }
1065
1066 // Conflict: required to use shared spaces (-Xshare:on), but
1067 // incompatible command line options were chosen.
1068
1069 static void no_shared_spaces() {
1070 if (RequireSharedSpaces) {
1071 jio_fprintf(defaultStream::error_stream(),
1072 "Class data sharing is inconsistent with other specified options.\n");
1073 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1074 } else {
1075 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1076 }
1077 }
1078
1079 void Arguments::set_tiered_flags() {
1080 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1081 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1082 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1083 }
1084 if (CompilationPolicyChoice < 2) {
1085 vm_exit_during_initialization(
1086 "Incompatible compilation policy selected", NULL);
1087 }
1088 // Increase the code cache size - tiered compiles a lot more.
1089 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1090 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1091 }
1092 if (!UseInterpreter) { // -Xcomp
1093 Tier3InvokeNotifyFreqLog = 0;
1094 Tier4InvocationThreshold = 0;
1095 }
1096 }
1097
1098 #if INCLUDE_ALL_GCS
1099 static void disable_adaptive_size_policy(const char* collector_name) {
1100 if (UseAdaptiveSizePolicy) {
1101 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1102 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1103 collector_name);
1104 }
1105 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1106 }
1107 }
1108
1109 void Arguments::set_parnew_gc_flags() {
1110 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1111 "control point invariant");
1112 assert(UseParNewGC, "Error");
1113
1114 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1115 disable_adaptive_size_policy("UseParNewGC");
1116
1117 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1118 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1119 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1120 } else if (ParallelGCThreads == 0) {
1121 jio_fprintf(defaultStream::error_stream(),
1122 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1123 vm_exit(1);
1124 }
1125
1126 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1127 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1128 // we set them to 1024 and 1024.
1129 // See CR 6362902.
1130 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1131 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1132 }
1133 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1134 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1135 }
1136
1137 // AlwaysTenure flag should make ParNew promote all at first collection.
1138 // See CR 6362902.
1139 if (AlwaysTenure) {
1140 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1141 }
1142 // When using compressed oops, we use local overflow stacks,
1143 // rather than using a global overflow list chained through
1144 // the klass word of the object's pre-image.
1145 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1146 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1147 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1148 }
1149 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1150 }
1151 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1152 }
1153
1154 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1155 // sparc/solaris for certain applications, but would gain from
1156 // further optimization and tuning efforts, and would almost
1157 // certainly gain from analysis of platform and environment.
1158 void Arguments::set_cms_and_parnew_gc_flags() {
1159 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1160 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1161
1162 // If we are using CMS, we prefer to UseParNewGC,
1163 // unless explicitly forbidden.
1164 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1165 FLAG_SET_ERGO(bool, UseParNewGC, true);
1166 }
1167
1168 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1169 disable_adaptive_size_policy("UseConcMarkSweepGC");
1170
1171 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1172 // as needed.
1173 if (UseParNewGC) {
1174 set_parnew_gc_flags();
1175 }
1176
1177 size_t max_heap = align_size_down(MaxHeapSize,
1178 CardTableRS::ct_max_alignment_constraint());
1179
1180 // Now make adjustments for CMS
1181 intx tenuring_default = (intx)6;
1182 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1183
1184 // Preferred young gen size for "short" pauses:
1185 // upper bound depends on # of threads and NewRatio.
1186 const uintx parallel_gc_threads =
1187 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1188 const size_t preferred_max_new_size_unaligned =
1189 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1190 size_t preferred_max_new_size =
1191 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1192
1193 // Unless explicitly requested otherwise, size young gen
1194 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1195
1196 // If either MaxNewSize or NewRatio is set on the command line,
1197 // assume the user is trying to set the size of the young gen.
1198 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1199
1200 // Set MaxNewSize to our calculated preferred_max_new_size unless
1201 // NewSize was set on the command line and it is larger than
1202 // preferred_max_new_size.
1203 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1204 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1205 } else {
1206 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1207 }
1208 if (PrintGCDetails && Verbose) {
1209 // Too early to use gclog_or_tty
1210 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1211 }
1212
1213 // Code along this path potentially sets NewSize and OldSize
1214 if (PrintGCDetails && Verbose) {
1215 // Too early to use gclog_or_tty
1216 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1217 " initial_heap_size: " SIZE_FORMAT
1218 " max_heap: " SIZE_FORMAT,
1219 min_heap_size(), InitialHeapSize, max_heap);
1220 }
1221 size_t min_new = preferred_max_new_size;
1222 if (FLAG_IS_CMDLINE(NewSize)) {
1223 min_new = NewSize;
1224 }
1225 if (max_heap > min_new && min_heap_size() > min_new) {
1226 // Unless explicitly requested otherwise, make young gen
1227 // at least min_new, and at most preferred_max_new_size.
1228 if (FLAG_IS_DEFAULT(NewSize)) {
1229 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1230 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1231 if (PrintGCDetails && Verbose) {
1232 // Too early to use gclog_or_tty
1233 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1234 }
1235 }
1236 // Unless explicitly requested otherwise, size old gen
1237 // so it's NewRatio x of NewSize.
1238 if (FLAG_IS_DEFAULT(OldSize)) {
1239 if (max_heap > NewSize) {
1240 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1241 if (PrintGCDetails && Verbose) {
1242 // Too early to use gclog_or_tty
1243 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1244 }
1245 }
1246 }
1247 }
1248 }
1249 // Unless explicitly requested otherwise, definitely
1250 // promote all objects surviving "tenuring_default" scavenges.
1251 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1252 FLAG_IS_DEFAULT(SurvivorRatio)) {
1253 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1254 }
1255 // If we decided above (or user explicitly requested)
1256 // `promote all' (via MaxTenuringThreshold := 0),
1257 // prefer minuscule survivor spaces so as not to waste
1258 // space for (non-existent) survivors
1259 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1260 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1261 }
1262 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1263 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1264 // This is done in order to make ParNew+CMS configuration to work
1265 // with YoungPLABSize and OldPLABSize options.
1266 // See CR 6362902.
1267 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1268 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1269 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1270 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1271 // the value (either from the command line or ergonomics) of
1272 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1273 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1274 } else {
1275 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1276 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1277 // we'll let it to take precedence.
1278 jio_fprintf(defaultStream::error_stream(),
1279 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1280 " options are specified for the CMS collector."
1281 " CMSParPromoteBlocksToClaim will take precedence.\n");
1282 }
1283 }
1284 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1285 // OldPLAB sizing manually turned off: Use a larger default setting,
1286 // unless it was manually specified. This is because a too-low value
1287 // will slow down scavenges.
1288 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1289 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1290 }
1291 }
1292 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1293 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1294 // If either of the static initialization defaults have changed, note this
1295 // modification.
1296 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1297 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1298 }
1299 if (PrintGCDetails && Verbose) {
1300 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1301 MarkStackSize / K, MarkStackSizeMax / K);
1302 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1303 }
1304 }
1305 #endif // INCLUDE_ALL_GCS
1306
1307 void set_object_alignment() {
1308 // Object alignment.
1309 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1310 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1311 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1312 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1313 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1314 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1315
1316 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1317 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1318
1319 // Oop encoding heap max
1320 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1321
1322 #if INCLUDE_ALL_GCS
1323 // Set CMS global values
1324 CompactibleFreeListSpace::set_cms_values();
1325 #endif // INCLUDE_ALL_GCS
1326 }
1327
1328 bool verify_object_alignment() {
1329 // Object alignment.
1330 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1331 jio_fprintf(defaultStream::error_stream(),
1332 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1333 (int)ObjectAlignmentInBytes);
1334 return false;
1335 }
1336 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1337 jio_fprintf(defaultStream::error_stream(),
1338 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1339 (int)ObjectAlignmentInBytes, BytesPerLong);
1340 return false;
1341 }
1342 // It does not make sense to have big object alignment
1343 // since a space lost due to alignment will be greater
1344 // then a saved space from compressed oops.
1345 if ((int)ObjectAlignmentInBytes > 256) {
1346 jio_fprintf(defaultStream::error_stream(),
1347 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1348 (int)ObjectAlignmentInBytes);
1349 return false;
1350 }
1351 // In case page size is very small.
1352 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1353 jio_fprintf(defaultStream::error_stream(),
1354 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1355 (int)ObjectAlignmentInBytes, os::vm_page_size());
1356 return false;
1357 }
1358 return true;
1359 }
1360
1361 inline uintx max_heap_for_compressed_oops() {
1362 // Avoid sign flip.
1363 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1364 return 0;
1365 }
1366 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1367 NOT_LP64(ShouldNotReachHere(); return 0);
1368 }
1369
1370 bool Arguments::should_auto_select_low_pause_collector() {
1371 if (UseAutoGCSelectPolicy &&
1372 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1373 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1374 if (PrintGCDetails) {
1375 // Cannot use gclog_or_tty yet.
1376 tty->print_cr("Automatic selection of the low pause collector"
1377 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1378 }
1379 return true;
1380 }
1381 return false;
1382 }
1383
1384 void Arguments::set_use_compressed_oops() {
1385 #ifndef ZERO
1386 #ifdef _LP64
1387 // MaxHeapSize is not set up properly at this point, but
1388 // the only value that can override MaxHeapSize if we are
1389 // to use UseCompressedOops is InitialHeapSize.
1390 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1391
1392 if (max_heap_size <= max_heap_for_compressed_oops()) {
1393 #if !defined(COMPILER1) || defined(TIERED)
1394 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1395 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1396 }
1397 #endif
1398 #ifdef _WIN64
1399 if (UseLargePages && UseCompressedOops) {
1400 // Cannot allocate guard pages for implicit checks in indexed addressing
1401 // mode, when large pages are specified on windows.
1402 // This flag could be switched ON if narrow oop base address is set to 0,
1403 // see code in Universe::initialize_heap().
1404 Universe::set_narrow_oop_use_implicit_null_checks(false);
1405 }
1406 #endif // _WIN64
1407 } else {
1408 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1409 warning("Max heap size too large for Compressed Oops");
1410 FLAG_SET_DEFAULT(UseCompressedOops, false);
1411 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1412 }
1413 }
1414 #endif // _LP64
1415 #endif // ZERO
1416 }
1417
1418 void Arguments::set_ergonomics_flags() {
1419
1420 if (os::is_server_class_machine()) {
1421 // If no other collector is requested explicitly,
1422 // let the VM select the collector based on
1423 // machine class and automatic selection policy.
1424 if (!UseSerialGC &&
1425 !UseConcMarkSweepGC &&
1426 !UseG1GC &&
1427 !UseParNewGC &&
1428 FLAG_IS_DEFAULT(UseParallelGC)) {
1429 if (should_auto_select_low_pause_collector()) {
1430 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1431 } else {
1432 FLAG_SET_ERGO(bool, UseParallelGC, true);
1433 }
1434 }
1435 // Shared spaces work fine with other GCs but causes bytecode rewriting
1436 // to be disabled, which hurts interpreter performance and decreases
1437 // server performance. On server class machines, keep the default
1438 // off unless it is asked for. Future work: either add bytecode rewriting
1439 // at link time, or rewrite bytecodes in non-shared methods.
1440 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1441 no_shared_spaces();
1442 }
1443 }
1444
1445 #ifndef ZERO
1446 #ifdef _LP64
1447 set_use_compressed_oops();
1448 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1449 if (!UseCompressedOops) {
1450 if (UseCompressedKlassPointers) {
1451 warning("UseCompressedKlassPointers requires UseCompressedOops");
1452 }
1453 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1454 } else {
1455 // Turn on UseCompressedKlassPointers too
1456 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1457 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1458 }
1459 // Set the ClassMetaspaceSize to something that will not need to be
1460 // expanded, since it cannot be expanded.
1461 if (UseCompressedKlassPointers) {
1462 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1463 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1464 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1465 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1466 // 100,000 classes seems like a good size, so 100M assumes around 1K
1467 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1468 // size per klass. Eventually, this will be parameterized because it
1469 // would also be useful to determine the optimal size of the
1470 // systemDictionary.
1471 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1472 }
1473 }
1474 }
1475 // Also checks that certain machines are slower with compressed oops
1476 // in vm_version initialization code.
1477 #endif // _LP64
1478 #endif // !ZERO
1479 }
1480
1481 void Arguments::set_parallel_gc_flags() {
1482 assert(UseParallelGC || UseParallelOldGC, "Error");
1483 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1484 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1485 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1486 }
1487 FLAG_SET_DEFAULT(UseParallelGC, true);
1488
1489 // If no heap maximum was requested explicitly, use some reasonable fraction
1490 // of the physical memory, up to a maximum of 1GB.
1491 FLAG_SET_DEFAULT(ParallelGCThreads,
1492 Abstract_VM_Version::parallel_worker_threads());
1493 if (ParallelGCThreads == 0) {
1494 jio_fprintf(defaultStream::error_stream(),
1495 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1496 vm_exit(1);
1497 }
1498
1499
1500 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1501 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1502 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1503 // See CR 6362902 for details.
1504 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1505 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1506 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1507 }
1508 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1509 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1510 }
1511 }
1512
1513 if (UseParallelOldGC) {
1514 // Par compact uses lower default values since they are treated as
1515 // minimums. These are different defaults because of the different
1516 // interpretation and are not ergonomically set.
1517 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1518 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1519 }
1520 }
1521 }
1522
1523 void Arguments::set_g1_gc_flags() {
1524 assert(UseG1GC, "Error");
1525 #ifdef COMPILER1
1526 FastTLABRefill = false;
1527 #endif
1528 FLAG_SET_DEFAULT(ParallelGCThreads,
1529 Abstract_VM_Version::parallel_worker_threads());
1530 if (ParallelGCThreads == 0) {
1531 FLAG_SET_DEFAULT(ParallelGCThreads,
1532 Abstract_VM_Version::parallel_worker_threads());
1533 }
1534
1535 // MarkStackSize will be set (if it hasn't been set by the user)
1536 // when concurrent marking is initialized.
1537 // Its value will be based upon the number of parallel marking threads.
1538 // But we do set the maximum mark stack size here.
1539 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1540 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1541 }
1542
1543 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1544 // In G1, we want the default GC overhead goal to be higher than
1545 // say in PS. So we set it here to 10%. Otherwise the heap might
1546 // be expanded more aggressively than we would like it to. In
1547 // fact, even 10% seems to not be high enough in some cases
1548 // (especially small GC stress tests that the main thing they do
1549 // is allocation). We might consider increase it further.
1550 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1551 }
1552
1553 if (PrintGCDetails && Verbose) {
1554 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1555 MarkStackSize / K, MarkStackSizeMax / K);
1556 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1557 }
1558 }
1559
1560 julong Arguments::limit_by_allocatable_memory(julong limit) {
1561 julong max_allocatable;
1562 julong result = limit;
1563 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1564 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1565 }
1566 return result;
1567 }
1568
1569 void Arguments::set_heap_size() {
1570 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1571 // Deprecated flag
1572 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1573 }
1574
1575 const julong phys_mem =
1576 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1577 : (julong)MaxRAM;
1578
1579 // If the maximum heap size has not been set with -Xmx,
1580 // then set it as fraction of the size of physical memory,
1581 // respecting the maximum and minimum sizes of the heap.
1582 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1583 julong reasonable_max = phys_mem / MaxRAMFraction;
1584
1585 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1586 // Small physical memory, so use a minimum fraction of it for the heap
1587 reasonable_max = phys_mem / MinRAMFraction;
1588 } else {
1589 // Not-small physical memory, so require a heap at least
1590 // as large as MaxHeapSize
1591 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1592 }
1593 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1594 // Limit the heap size to ErgoHeapSizeLimit
1595 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1596 }
1597 if (UseCompressedOops) {
1598 // Limit the heap size to the maximum possible when using compressed oops
1599 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1600 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1601 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1602 // but it should be not less than default MaxHeapSize.
1603 max_coop_heap -= HeapBaseMinAddress;
1604 }
1605 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1606 }
1607 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1608
1609 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1610 // An initial heap size was specified on the command line,
1611 // so be sure that the maximum size is consistent. Done
1612 // after call to limit_by_allocatable_memory because that
1613 // method might reduce the allocation size.
1614 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1615 }
1616
1617 if (PrintGCDetails && Verbose) {
1618 // Cannot use gclog_or_tty yet.
1619 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1620 }
1621 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1622 }
1623
1624 // If the minimum or initial heap_size have not been set or requested to be set
1625 // ergonomically, set them accordingly.
1626 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1627 julong reasonable_minimum = (julong)(OldSize + NewSize);
1628
1629 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1630
1631 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1632
1633 if (InitialHeapSize == 0) {
1634 julong reasonable_initial = phys_mem / InitialRAMFraction;
1635
1636 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1637 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1638
1639 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1640
1641 if (PrintGCDetails && Verbose) {
1642 // Cannot use gclog_or_tty yet.
1643 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1644 }
1645 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1646 }
1647 // If the minimum heap size has not been set (via -Xms),
1648 // synchronize with InitialHeapSize to avoid errors with the default value.
1649 if (min_heap_size() == 0) {
1650 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1651 if (PrintGCDetails && Verbose) {
1652 // Cannot use gclog_or_tty yet.
1653 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1654 }
1655 }
1656 }
1657 }
1658
1659 // This must be called after ergonomics because we want bytecode rewriting
1660 // if the server compiler is used, or if UseSharedSpaces is disabled.
1661 void Arguments::set_bytecode_flags() {
1662 // Better not attempt to store into a read-only space.
1663 if (UseSharedSpaces) {
1664 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1665 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1666 }
1667
1668 if (!RewriteBytecodes) {
1669 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1670 }
1671 }
1672
1673 // Aggressive optimization flags -XX:+AggressiveOpts
1674 void Arguments::set_aggressive_opts_flags() {
1675 #ifdef COMPILER2
1676 if (AggressiveUnboxing) {
1677 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1678 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1679 } else if (!EliminateAutoBox) {
1680 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1681 AggressiveUnboxing = false;
1682 }
1683 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1684 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1685 } else if (!DoEscapeAnalysis) {
1686 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1687 AggressiveUnboxing = false;
1688 }
1689 }
1690 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1691 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1692 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1693 }
1694 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1695 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1696 }
1697
1698 // Feed the cache size setting into the JDK
1699 char buffer[1024];
1700 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1701 add_property(buffer);
1702 }
1703 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1704 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1705 }
1706 #endif
1707
1708 if (AggressiveOpts) {
1709 // Sample flag setting code
1710 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1711 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1712 // }
1713 }
1714 }
1715
1716 //===========================================================================================================
1717 // Parsing of java.compiler property
1718
1719 void Arguments::process_java_compiler_argument(char* arg) {
1720 // For backwards compatibility, Djava.compiler=NONE or ""
1721 // causes us to switch to -Xint mode UNLESS -Xdebug
1722 // is also specified.
1723 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1724 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1725 }
1726 }
1727
1728 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1729 _sun_java_launcher = strdup(launcher);
1730 if (strcmp("gamma", _sun_java_launcher) == 0) {
1731 _created_by_gamma_launcher = true;
1732 }
1733 }
1734
1735 bool Arguments::created_by_java_launcher() {
1736 assert(_sun_java_launcher != NULL, "property must have value");
1737 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1738 }
1739
1740 bool Arguments::created_by_gamma_launcher() {
1741 return _created_by_gamma_launcher;
1742 }
1743
1744 //===========================================================================================================
1745 // Parsing of main arguments
1746
1747 bool Arguments::verify_interval(uintx val, uintx min,
1748 uintx max, const char* name) {
1749 // Returns true iff value is in the inclusive interval [min..max]
1750 // false, otherwise.
1751 if (val >= min && val <= max) {
1752 return true;
1753 }
1754 jio_fprintf(defaultStream::error_stream(),
1755 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1756 " and " UINTX_FORMAT "\n",
1757 name, val, min, max);
1758 return false;
1759 }
1760
1761 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1762 // Returns true if given value is at least specified min threshold
1763 // false, otherwise.
1764 if (val >= min ) {
1765 return true;
1766 }
1767 jio_fprintf(defaultStream::error_stream(),
1768 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1769 name, val, min);
1770 return false;
1771 }
1772
1773 bool Arguments::verify_percentage(uintx value, const char* name) {
1774 if (value <= 100) {
1775 return true;
1776 }
1777 jio_fprintf(defaultStream::error_stream(),
1778 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1779 name, value);
1780 return false;
1781 }
1782
1783 #if !INCLUDE_ALL_GCS
1784 #ifdef ASSERT
1785 static bool verify_serial_gc_flags() {
1786 return (UseSerialGC &&
1787 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1788 UseParallelGC || UseParallelOldGC));
1789 }
1790 #endif // ASSERT
1791 #endif // INCLUDE_ALL_GCS
1792
1793 // check if do gclog rotation
1794 // +UseGCLogFileRotation is a must,
1795 // no gc log rotation when log file not supplied or
1796 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1797 void check_gclog_consistency() {
1798 if (UseGCLogFileRotation) {
1799 if ((Arguments::gc_log_filename() == NULL) ||
1800 (NumberOfGCLogFiles == 0) ||
1801 (GCLogFileSize == 0)) {
1802 jio_fprintf(defaultStream::output_stream(),
1803 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1804 "where num_of_file > 0 and num_of_size > 0\n"
1805 "GC log rotation is turned off\n");
1806 UseGCLogFileRotation = false;
1807 }
1808 }
1809
1810 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1811 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1812 jio_fprintf(defaultStream::output_stream(),
1813 "GCLogFileSize changed to minimum 8K\n");
1814 }
1815 }
1816
1817 // Check consistency of GC selection
1818 bool Arguments::check_gc_consistency() {
1819 check_gclog_consistency();
1820 bool status = true;
1821 // Ensure that the user has not selected conflicting sets
1822 // of collectors. [Note: this check is merely a user convenience;
1823 // collectors over-ride each other so that only a non-conflicting
1824 // set is selected; however what the user gets is not what they
1825 // may have expected from the combination they asked for. It's
1826 // better to reduce user confusion by not allowing them to
1827 // select conflicting combinations.
1828 uint i = 0;
1829 if (UseSerialGC) i++;
1830 if (UseConcMarkSweepGC || UseParNewGC) i++;
1831 if (UseParallelGC || UseParallelOldGC) i++;
1832 if (UseG1GC) i++;
1833 if (i > 1) {
1834 jio_fprintf(defaultStream::error_stream(),
1835 "Conflicting collector combinations in option list; "
1836 "please refer to the release notes for the combinations "
1837 "allowed\n");
1838 status = false;
1839 }
1840
1841 return status;
1842 }
1843
1844 void Arguments::check_deprecated_gcs() {
1845 if (UseConcMarkSweepGC && !UseParNewGC) {
1846 warning("Using the DefNew young collector with the CMS collector is deprecated "
1847 "and will likely be removed in a future release");
1848 }
1849
1850 if (UseParNewGC && !UseConcMarkSweepGC) {
1851 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1852 // set up UseSerialGC properly, so that can't be used in the check here.
1853 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1854 "and will likely be removed in a future release");
1855 }
1856
1857 if (CMSIncrementalMode) {
1858 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1859 }
1860 }
1861
1862 void Arguments::check_deprecated_gc_flags() {
1863 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1864 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1865 "and will likely be removed in future release");
1866 }
1867 }
1868
1869 // Check stack pages settings
1870 bool Arguments::check_stack_pages()
1871 {
1872 bool status = true;
1873 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1874 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1875 // greater stack shadow pages can't generate instruction to bang stack
1876 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1877 return status;
1878 }
1879
1880 // Check the consistency of vm_init_args
1881 bool Arguments::check_vm_args_consistency() {
1882 // Method for adding checks for flag consistency.
1883 // The intent is to warn the user of all possible conflicts,
1884 // before returning an error.
1885 // Note: Needs platform-dependent factoring.
1886 bool status = true;
1887
1888 #if ( (defined(COMPILER2) && defined(SPARC)))
1889 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1890 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1891 // x86. Normally, VM_Version_init must be called from init_globals in
1892 // init.cpp, which is called by the initial java thread *after* arguments
1893 // have been parsed. VM_Version_init gets called twice on sparc.
1894 extern void VM_Version_init();
1895 VM_Version_init();
1896 if (!VM_Version::has_v9()) {
1897 jio_fprintf(defaultStream::error_stream(),
1898 "V8 Machine detected, Server requires V9\n");
1899 status = false;
1900 }
1901 #endif /* COMPILER2 && SPARC */
1902
1903 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1904 // builds so the cost of stack banging can be measured.
1905 #if (defined(PRODUCT) && defined(SOLARIS))
1906 if (!UseBoundThreads && !UseStackBanging) {
1907 jio_fprintf(defaultStream::error_stream(),
1908 "-UseStackBanging conflicts with -UseBoundThreads\n");
1909
1910 status = false;
1911 }
1912 #endif
1913
1914 if (TLABRefillWasteFraction == 0) {
1915 jio_fprintf(defaultStream::error_stream(),
1916 "TLABRefillWasteFraction should be a denominator, "
1917 "not " SIZE_FORMAT "\n",
1918 TLABRefillWasteFraction);
1919 status = false;
1920 }
1921
1922 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1923 "AdaptiveSizePolicyWeight");
1924 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1925 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1926 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1927
1928 // Divide by bucket size to prevent a large size from causing rollover when
1929 // calculating amount of memory needed to be allocated for the String table.
1930 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1931 (max_uintx / StringTable::bucket_size()), "StringTable size");
1932
1933 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1934 jio_fprintf(defaultStream::error_stream(),
1935 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1936 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1937 MinHeapFreeRatio, MaxHeapFreeRatio);
1938 status = false;
1939 }
1940 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1941 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1942
1943 // Min/MaxMetaspaceFreeRatio
1944 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1945 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1946
1947 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1948 jio_fprintf(defaultStream::error_stream(),
1949 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1950 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1951 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1952 MinMetaspaceFreeRatio,
1953 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1954 MaxMetaspaceFreeRatio);
1955 status = false;
1956 }
1957
1958 // Trying to keep 100% free is not practical
1959 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1960
1961 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1962 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1963 }
1964
1965 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1966 // Settings to encourage splitting.
1967 if (!FLAG_IS_CMDLINE(NewRatio)) {
1968 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1969 }
1970 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1971 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1972 }
1973 }
1974
1975 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1976 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1977 if (GCTimeLimit == 100) {
1978 // Turn off gc-overhead-limit-exceeded checks
1979 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1980 }
1981
1982 status = status && check_gc_consistency();
1983 status = status && check_stack_pages();
1984
1985 if (_has_alloc_profile) {
1986 if (UseParallelGC || UseParallelOldGC) {
1987 jio_fprintf(defaultStream::error_stream(),
1988 "error: invalid argument combination.\n"
1989 "Allocation profiling (-Xaprof) cannot be used together with "
1990 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1991 status = false;
1992 }
1993 if (UseConcMarkSweepGC) {
1994 jio_fprintf(defaultStream::error_stream(),
1995 "error: invalid argument combination.\n"
1996 "Allocation profiling (-Xaprof) cannot be used together with "
1997 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1998 status = false;
1999 }
2000 }
2001
2002 if (CMSIncrementalMode) {
2003 if (!UseConcMarkSweepGC) {
2004 jio_fprintf(defaultStream::error_stream(),
2005 "error: invalid argument combination.\n"
2006 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2007 "selected in order\nto use CMSIncrementalMode.\n");
2008 status = false;
2009 } else {
2010 status = status && verify_percentage(CMSIncrementalDutyCycle,
2011 "CMSIncrementalDutyCycle");
2012 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2013 "CMSIncrementalDutyCycleMin");
2014 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2015 "CMSIncrementalSafetyFactor");
2016 status = status && verify_percentage(CMSIncrementalOffset,
2017 "CMSIncrementalOffset");
2018 status = status && verify_percentage(CMSExpAvgFactor,
2019 "CMSExpAvgFactor");
2020 // If it was not set on the command line, set
2021 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2022 if (CMSInitiatingOccupancyFraction < 0) {
2023 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2024 }
2025 }
2026 }
2027
2028 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2029 // insists that we hold the requisite locks so that the iteration is
2030 // MT-safe. For the verification at start-up and shut-down, we don't
2031 // yet have a good way of acquiring and releasing these locks,
2032 // which are not visible at the CollectedHeap level. We want to
2033 // be able to acquire these locks and then do the iteration rather
2034 // than just disable the lock verification. This will be fixed under
2035 // bug 4788986.
2036 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2037 if (VerifyDuringStartup) {
2038 warning("Heap verification at start-up disabled "
2039 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2040 VerifyDuringStartup = false; // Disable verification at start-up
2041 }
2042
2043 if (VerifyBeforeExit) {
2044 warning("Heap verification at shutdown disabled "
2045 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2046 VerifyBeforeExit = false; // Disable verification at shutdown
2047 }
2048 }
2049
2050 // Note: only executed in non-PRODUCT mode
2051 if (!UseAsyncConcMarkSweepGC &&
2052 (ExplicitGCInvokesConcurrent ||
2053 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2054 jio_fprintf(defaultStream::error_stream(),
2055 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2056 " with -UseAsyncConcMarkSweepGC");
2057 status = false;
2058 }
2059
2060 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2061
2062 #if INCLUDE_ALL_GCS
2063 if (UseG1GC) {
2064 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2065 "InitiatingHeapOccupancyPercent");
2066 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2067 "G1RefProcDrainInterval");
2068 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2069 "G1ConcMarkStepDurationMillis");
2070 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2071 "G1ConcRSHotCardLimit");
2072 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2073 "G1ConcRSLogCacheSize");
2074 }
2075 if (UseConcMarkSweepGC) {
2076 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2077 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2078 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2079 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2080
2081 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2082
2083 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2084 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2085 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2086
2087 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2088
2089 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2090 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2091
2092 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2093 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2094 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2095
2096 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2097
2098 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2099
2100 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2101 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2102 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2103 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2104 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2105 }
2106
2107 if (UseParallelGC || UseParallelOldGC) {
2108 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2109 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2110
2111 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2112 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2113
2114 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2115 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2116
2117 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2118
2119 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2120 }
2121 #endif // INCLUDE_ALL_GCS
2122
2123 status = status && verify_interval(RefDiscoveryPolicy,
2124 ReferenceProcessor::DiscoveryPolicyMin,
2125 ReferenceProcessor::DiscoveryPolicyMax,
2126 "RefDiscoveryPolicy");
2127
2128 // Limit the lower bound of this flag to 1 as it is used in a division
2129 // expression.
2130 status = status && verify_interval(TLABWasteTargetPercent,
2131 1, 100, "TLABWasteTargetPercent");
2132
2133 status = status && verify_object_alignment();
2134
2135 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2136 "ClassMetaspaceSize");
2137
2138 status = status && verify_interval(MarkStackSizeMax,
2139 1, (max_jint - 1), "MarkStackSizeMax");
2140 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2141
2142 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2143
2144 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2145
2146 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2147
2148 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2149 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2150
2151 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2152
2153 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2154 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2155 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2156 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2157
2158 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2159 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2160
2161 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2162 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2163 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2164
2165 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2166 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2167
2168 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2169 // just for that, so hardcode here.
2170 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2171 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2172 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2173 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2174
2175 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2176 #ifdef SPARC
2177 if (UseConcMarkSweepGC || UseG1GC) {
2178 // Issue a stern warning if the user has explicitly set
2179 // UseMemSetInBOT (it is known to cause issues), but allow
2180 // use for experimentation and debugging.
2181 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2182 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2183 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2184 " on sun4v; please understand that you are using at your own risk!");
2185 }
2186 }
2187 #endif // SPARC
2188
2189 if (PrintNMTStatistics) {
2190 #if INCLUDE_NMT
2191 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2192 #endif // INCLUDE_NMT
2193 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2194 PrintNMTStatistics = false;
2195 #if INCLUDE_NMT
2196 }
2197 #endif
2198 }
2199
2200 // Need to limit the extent of the padding to reasonable size.
2201 // 8K is well beyond the reasonable HW cache line size, even with the
2202 // aggressive prefetching, while still leaving the room for segregating
2203 // among the distinct pages.
2204 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2205 jio_fprintf(defaultStream::error_stream(),
2206 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n",
2207 ContendedPaddingWidth, 0, 8192);
2208 status = false;
2209 }
2210
2211 // Need to enforce the padding not to break the existing field alignments.
2212 // It is sufficient to check against the largest type size.
2213 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2214 jio_fprintf(defaultStream::error_stream(),
2215 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n",
2216 ContendedPaddingWidth, BytesPerLong);
2217 status = false;
2218 }
2219
2220 return status;
2221 }
2222
2223 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2224 const char* option_type) {
2225 if (ignore) return false;
2226
2227 const char* spacer = " ";
2228 if (option_type == NULL) {
2229 option_type = ++spacer; // Set both to the empty string.
2230 }
2231
2232 if (os::obsolete_option(option)) {
2233 jio_fprintf(defaultStream::error_stream(),
2234 "Obsolete %s%soption: %s\n", option_type, spacer,
2235 option->optionString);
2236 return false;
2237 } else {
2238 jio_fprintf(defaultStream::error_stream(),
2239 "Unrecognized %s%soption: %s\n", option_type, spacer,
2240 option->optionString);
2241 return true;
2242 }
2243 }
2244
2245 static const char* user_assertion_options[] = {
2246 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2247 };
2248
2249 static const char* system_assertion_options[] = {
2250 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2251 };
2252
2253 // Return true if any of the strings in null-terminated array 'names' matches.
2254 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2255 // the option must match exactly.
2256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2257 bool tail_allowed) {
2258 for (/* empty */; *names != NULL; ++names) {
2259 if (match_option(option, *names, tail)) {
2260 if (**tail == '\0' || tail_allowed && **tail == ':') {
2261 return true;
2262 }
2263 }
2264 }
2265 return false;
2266 }
2267
2268 bool Arguments::parse_uintx(const char* value,
2269 uintx* uintx_arg,
2270 uintx min_size) {
2271
2272 // Check the sign first since atomull() parses only unsigned values.
2273 bool value_is_positive = !(*value == '-');
2274
2275 if (value_is_positive) {
2276 julong n;
2277 bool good_return = atomull(value, &n);
2278 if (good_return) {
2279 bool above_minimum = n >= min_size;
2280 bool value_is_too_large = n > max_uintx;
2281
2282 if (above_minimum && !value_is_too_large) {
2283 *uintx_arg = n;
2284 return true;
2285 }
2286 }
2287 }
2288 return false;
2289 }
2290
2291 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2292 julong* long_arg,
2293 julong min_size) {
2294 if (!atomull(s, long_arg)) return arg_unreadable;
2295 return check_memory_size(*long_arg, min_size);
2296 }
2297
2298 // Parse JavaVMInitArgs structure
2299
2300 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2301 // For components of the system classpath.
2302 SysClassPath scp(Arguments::get_sysclasspath());
2303 bool scp_assembly_required = false;
2304
2305 // Save default settings for some mode flags
2306 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2307 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2308 Arguments::_ClipInlining = ClipInlining;
2309 Arguments::_BackgroundCompilation = BackgroundCompilation;
2310
2311 // Setup flags for mixed which is the default
2312 set_mode_flags(_mixed);
2313
2314 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2315 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2316 if (result != JNI_OK) {
2317 return result;
2318 }
2319
2320 // Parse JavaVMInitArgs structure passed in
2321 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2322 if (result != JNI_OK) {
2323 return result;
2324 }
2325
2326 if (AggressiveOpts) {
2327 // Insert alt-rt.jar between user-specified bootclasspath
2328 // prefix and the default bootclasspath. os::set_boot_path()
2329 // uses meta_index_dir as the default bootclasspath directory.
2330 const char* altclasses_jar = "alt-rt.jar";
2331 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2332 strlen(altclasses_jar);
2333 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2334 strcpy(altclasses_path, get_meta_index_dir());
2335 strcat(altclasses_path, altclasses_jar);
2336 scp.add_suffix_to_prefix(altclasses_path);
2337 scp_assembly_required = true;
2338 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2339 }
2340
2341 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2342 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2343 if (result != JNI_OK) {
2344 return result;
2345 }
2346
2347 // Do final processing now that all arguments have been parsed
2348 result = finalize_vm_init_args(&scp, scp_assembly_required);
2349 if (result != JNI_OK) {
2350 return result;
2351 }
2352
2353 return JNI_OK;
2354 }
2355
2356 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2357 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2358 // are dealing with -agentpath (case where name is a path), otherwise with
2359 // -agentlib
2360 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2361 char *_name;
2362 const char *_hprof = "hprof", *_jdwp = "jdwp";
2363 size_t _len_hprof, _len_jdwp, _len_prefix;
2364
2365 if (is_path) {
2366 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2367 return false;
2368 }
2369
2370 _name++; // skip past last path separator
2371 _len_prefix = strlen(JNI_LIB_PREFIX);
2372
2373 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2374 return false;
2375 }
2376
2377 _name += _len_prefix;
2378 _len_hprof = strlen(_hprof);
2379 _len_jdwp = strlen(_jdwp);
2380
2381 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2382 _name += _len_hprof;
2383 }
2384 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2385 _name += _len_jdwp;
2386 }
2387 else {
2388 return false;
2389 }
2390
2391 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2392 return false;
2393 }
2394
2395 return true;
2396 }
2397
2398 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2399 return true;
2400 }
2401
2402 return false;
2403 }
2404
2405 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2406 SysClassPath* scp_p,
2407 bool* scp_assembly_required_p,
2408 FlagValueOrigin origin) {
2409 // Remaining part of option string
2410 const char* tail;
2411
2412 // iterate over arguments
2413 for (int index = 0; index < args->nOptions; index++) {
2414 bool is_absolute_path = false; // for -agentpath vs -agentlib
2415
2416 const JavaVMOption* option = args->options + index;
2417
2418 if (!match_option(option, "-Djava.class.path", &tail) &&
2419 !match_option(option, "-Dsun.java.command", &tail) &&
2420 !match_option(option, "-Dsun.java.launcher", &tail)) {
2421
2422 // add all jvm options to the jvm_args string. This string
2423 // is used later to set the java.vm.args PerfData string constant.
2424 // the -Djava.class.path and the -Dsun.java.command options are
2425 // omitted from jvm_args string as each have their own PerfData
2426 // string constant object.
2427 build_jvm_args(option->optionString);
2428 }
2429
2430 // -verbose:[class/gc/jni]
2431 if (match_option(option, "-verbose", &tail)) {
2432 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2433 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2434 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2435 } else if (!strcmp(tail, ":gc")) {
2436 FLAG_SET_CMDLINE(bool, PrintGC, true);
2437 } else if (!strcmp(tail, ":jni")) {
2438 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2439 }
2440 // -da / -ea / -disableassertions / -enableassertions
2441 // These accept an optional class/package name separated by a colon, e.g.,
2442 // -da:java.lang.Thread.
2443 } else if (match_option(option, user_assertion_options, &tail, true)) {
2444 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2445 if (*tail == '\0') {
2446 JavaAssertions::setUserClassDefault(enable);
2447 } else {
2448 assert(*tail == ':', "bogus match by match_option()");
2449 JavaAssertions::addOption(tail + 1, enable);
2450 }
2451 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2452 } else if (match_option(option, system_assertion_options, &tail, false)) {
2453 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2454 JavaAssertions::setSystemClassDefault(enable);
2455 // -bootclasspath:
2456 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2457 scp_p->reset_path(tail);
2458 *scp_assembly_required_p = true;
2459 // -bootclasspath/a:
2460 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2461 scp_p->add_suffix(tail);
2462 *scp_assembly_required_p = true;
2463 // -bootclasspath/p:
2464 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2465 scp_p->add_prefix(tail);
2466 *scp_assembly_required_p = true;
2467 // -Xrun
2468 } else if (match_option(option, "-Xrun", &tail)) {
2469 if (tail != NULL) {
2470 const char* pos = strchr(tail, ':');
2471 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2472 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2473 name[len] = '\0';
2474
2475 char *options = NULL;
2476 if(pos != NULL) {
2477 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2478 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2479 }
2480 #if !INCLUDE_JVMTI
2481 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2482 jio_fprintf(defaultStream::error_stream(),
2483 "Profiling and debugging agents are not supported in this VM\n");
2484 return JNI_ERR;
2485 }
2486 #endif // !INCLUDE_JVMTI
2487 add_init_library(name, options);
2488 }
2489 // -agentlib and -agentpath
2490 } else if (match_option(option, "-agentlib:", &tail) ||
2491 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2492 if(tail != NULL) {
2493 const char* pos = strchr(tail, '=');
2494 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2495 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2496 name[len] = '\0';
2497
2498 char *options = NULL;
2499 if(pos != NULL) {
2500 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2501 }
2502 #if !INCLUDE_JVMTI
2503 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2504 jio_fprintf(defaultStream::error_stream(),
2505 "Profiling and debugging agents are not supported in this VM\n");
2506 return JNI_ERR;
2507 }
2508 #endif // !INCLUDE_JVMTI
2509 add_init_agent(name, options, is_absolute_path);
2510 }
2511 // -javaagent
2512 } else if (match_option(option, "-javaagent:", &tail)) {
2513 #if !INCLUDE_JVMTI
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Instrumentation agents are not supported in this VM\n");
2516 return JNI_ERR;
2517 #else
2518 if(tail != NULL) {
2519 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2520 add_init_agent("instrument", options, false);
2521 }
2522 #endif // !INCLUDE_JVMTI
2523 // -Xnoclassgc
2524 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2525 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2526 // -Xincgc: i-CMS
2527 } else if (match_option(option, "-Xincgc", &tail)) {
2528 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2529 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2530 // -Xnoincgc: no i-CMS
2531 } else if (match_option(option, "-Xnoincgc", &tail)) {
2532 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2533 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2534 // -Xconcgc
2535 } else if (match_option(option, "-Xconcgc", &tail)) {
2536 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2537 // -Xnoconcgc
2538 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2539 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2540 // -Xbatch
2541 } else if (match_option(option, "-Xbatch", &tail)) {
2542 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2543 // -Xmn for compatibility with other JVM vendors
2544 } else if (match_option(option, "-Xmn", &tail)) {
2545 julong long_initial_eden_size = 0;
2546 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2547 if (errcode != arg_in_range) {
2548 jio_fprintf(defaultStream::error_stream(),
2549 "Invalid initial eden size: %s\n", option->optionString);
2550 describe_range_error(errcode);
2551 return JNI_EINVAL;
2552 }
2553 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2554 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2555 // -Xms
2556 } else if (match_option(option, "-Xms", &tail)) {
2557 julong long_initial_heap_size = 0;
2558 // an initial heap size of 0 means automatically determine
2559 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2560 if (errcode != arg_in_range) {
2561 jio_fprintf(defaultStream::error_stream(),
2562 "Invalid initial heap size: %s\n", option->optionString);
2563 describe_range_error(errcode);
2564 return JNI_EINVAL;
2565 }
2566 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2567 // Currently the minimum size and the initial heap sizes are the same.
2568 set_min_heap_size(InitialHeapSize);
2569 // -Xmx
2570 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2571 julong long_max_heap_size = 0;
2572 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2573 if (errcode != arg_in_range) {
2574 jio_fprintf(defaultStream::error_stream(),
2575 "Invalid maximum heap size: %s\n", option->optionString);
2576 describe_range_error(errcode);
2577 return JNI_EINVAL;
2578 }
2579 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2580 // Xmaxf
2581 } else if (match_option(option, "-Xmaxf", &tail)) {
2582 int maxf = (int)(atof(tail) * 100);
2583 if (maxf < 0 || maxf > 100) {
2584 jio_fprintf(defaultStream::error_stream(),
2585 "Bad max heap free percentage size: %s\n",
2586 option->optionString);
2587 return JNI_EINVAL;
2588 } else {
2589 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2590 }
2591 // Xminf
2592 } else if (match_option(option, "-Xminf", &tail)) {
2593 int minf = (int)(atof(tail) * 100);
2594 if (minf < 0 || minf > 100) {
2595 jio_fprintf(defaultStream::error_stream(),
2596 "Bad min heap free percentage size: %s\n",
2597 option->optionString);
2598 return JNI_EINVAL;
2599 } else {
2600 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2601 }
2602 // -Xss
2603 } else if (match_option(option, "-Xss", &tail)) {
2604 julong long_ThreadStackSize = 0;
2605 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2606 if (errcode != arg_in_range) {
2607 jio_fprintf(defaultStream::error_stream(),
2608 "Invalid thread stack size: %s\n", option->optionString);
2609 describe_range_error(errcode);
2610 return JNI_EINVAL;
2611 }
2612 // Internally track ThreadStackSize in units of 1024 bytes.
2613 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2614 round_to((int)long_ThreadStackSize, K) / K);
2615 // -Xoss
2616 } else if (match_option(option, "-Xoss", &tail)) {
2617 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2618 // -Xmaxjitcodesize
2619 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2620 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2621 julong long_ReservedCodeCacheSize = 0;
2622 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2623 (size_t)InitialCodeCacheSize);
2624 if (errcode != arg_in_range) {
2625 jio_fprintf(defaultStream::error_stream(),
2626 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2627 option->optionString, InitialCodeCacheSize/K);
2628 describe_range_error(errcode);
2629 return JNI_EINVAL;
2630 }
2631 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2632 //-XX:IncreaseFirstTierCompileThresholdAt=
2633 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2634 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2635 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2636 jio_fprintf(defaultStream::error_stream(),
2637 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2638 option->optionString);
2639 return JNI_EINVAL;
2640 }
2641 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2642 // -green
2643 } else if (match_option(option, "-green", &tail)) {
2644 jio_fprintf(defaultStream::error_stream(),
2645 "Green threads support not available\n");
2646 return JNI_EINVAL;
2647 // -native
2648 } else if (match_option(option, "-native", &tail)) {
2649 // HotSpot always uses native threads, ignore silently for compatibility
2650 // -Xsqnopause
2651 } else if (match_option(option, "-Xsqnopause", &tail)) {
2652 // EVM option, ignore silently for compatibility
2653 // -Xrs
2654 } else if (match_option(option, "-Xrs", &tail)) {
2655 // Classic/EVM option, new functionality
2656 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2657 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2658 // change default internal VM signals used - lower case for back compat
2659 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2660 // -Xoptimize
2661 } else if (match_option(option, "-Xoptimize", &tail)) {
2662 // EVM option, ignore silently for compatibility
2663 // -Xprof
2664 } else if (match_option(option, "-Xprof", &tail)) {
2665 #if INCLUDE_FPROF
2666 _has_profile = true;
2667 #else // INCLUDE_FPROF
2668 jio_fprintf(defaultStream::error_stream(),
2669 "Flat profiling is not supported in this VM.\n");
2670 return JNI_ERR;
2671 #endif // INCLUDE_FPROF
2672 // -Xaprof
2673 } else if (match_option(option, "-Xaprof", &tail)) {
2674 _has_alloc_profile = true;
2675 // -Xconcurrentio
2676 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2677 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2678 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2679 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2680 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2681 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2682
2683 // -Xinternalversion
2684 } else if (match_option(option, "-Xinternalversion", &tail)) {
2685 jio_fprintf(defaultStream::output_stream(), "%s\n",
2686 VM_Version::internal_vm_info_string());
2687 vm_exit(0);
2688 #ifndef PRODUCT
2689 // -Xprintflags
2690 } else if (match_option(option, "-Xprintflags", &tail)) {
2691 CommandLineFlags::printFlags(tty, false);
2692 vm_exit(0);
2693 #endif
2694 // -D
2695 } else if (match_option(option, "-D", &tail)) {
2696 if (!add_property(tail)) {
2697 return JNI_ENOMEM;
2698 }
2699 // Out of the box management support
2700 if (match_option(option, "-Dcom.sun.management", &tail)) {
2701 #if INCLUDE_MANAGEMENT
2702 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2703 #else
2704 jio_fprintf(defaultStream::output_stream(),
2705 "-Dcom.sun.management is not supported in this VM.\n");
2706 return JNI_ERR;
2707 #endif
2708 }
2709 // -Xint
2710 } else if (match_option(option, "-Xint", &tail)) {
2711 set_mode_flags(_int);
2712 // -Xmixed
2713 } else if (match_option(option, "-Xmixed", &tail)) {
2714 set_mode_flags(_mixed);
2715 // -Xcomp
2716 } else if (match_option(option, "-Xcomp", &tail)) {
2717 // for testing the compiler; turn off all flags that inhibit compilation
2718 set_mode_flags(_comp);
2719 // -Xshare:dump
2720 } else if (match_option(option, "-Xshare:dump", &tail)) {
2721 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2722 set_mode_flags(_int); // Prevent compilation, which creates objects
2723 // -Xshare:on
2724 } else if (match_option(option, "-Xshare:on", &tail)) {
2725 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2726 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2727 // -Xshare:auto
2728 } else if (match_option(option, "-Xshare:auto", &tail)) {
2729 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2730 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2731 // -Xshare:off
2732 } else if (match_option(option, "-Xshare:off", &tail)) {
2733 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2734 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2735 // -Xverify
2736 } else if (match_option(option, "-Xverify", &tail)) {
2737 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2738 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2739 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2740 } else if (strcmp(tail, ":remote") == 0) {
2741 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2742 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2743 } else if (strcmp(tail, ":none") == 0) {
2744 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2745 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2746 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2747 return JNI_EINVAL;
2748 }
2749 // -Xdebug
2750 } else if (match_option(option, "-Xdebug", &tail)) {
2751 // note this flag has been used, then ignore
2752 set_xdebug_mode(true);
2753 // -Xnoagent
2754 } else if (match_option(option, "-Xnoagent", &tail)) {
2755 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2756 } else if (match_option(option, "-Xboundthreads", &tail)) {
2757 // Bind user level threads to kernel threads (Solaris only)
2758 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2759 } else if (match_option(option, "-Xloggc:", &tail)) {
2760 // Redirect GC output to the file. -Xloggc:<filename>
2761 // ostream_init_log(), when called will use this filename
2762 // to initialize a fileStream.
2763 _gc_log_filename = strdup(tail);
2764 FLAG_SET_CMDLINE(bool, PrintGC, true);
2765 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2766
2767 // JNI hooks
2768 } else if (match_option(option, "-Xcheck", &tail)) {
2769 if (!strcmp(tail, ":jni")) {
2770 #if !INCLUDE_JNI_CHECK
2771 warning("JNI CHECKING is not supported in this VM");
2772 #else
2773 CheckJNICalls = true;
2774 #endif // INCLUDE_JNI_CHECK
2775 } else if (is_bad_option(option, args->ignoreUnrecognized,
2776 "check")) {
2777 return JNI_EINVAL;
2778 }
2779 } else if (match_option(option, "vfprintf", &tail)) {
2780 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2781 } else if (match_option(option, "exit", &tail)) {
2782 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2783 } else if (match_option(option, "abort", &tail)) {
2784 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2785 // -XX:+AggressiveHeap
2786 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2787
2788 // This option inspects the machine and attempts to set various
2789 // parameters to be optimal for long-running, memory allocation
2790 // intensive jobs. It is intended for machines with large
2791 // amounts of cpu and memory.
2792
2793 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2794 // VM, but we may not be able to represent the total physical memory
2795 // available (like having 8gb of memory on a box but using a 32bit VM).
2796 // Thus, we need to make sure we're using a julong for intermediate
2797 // calculations.
2798 julong initHeapSize;
2799 julong total_memory = os::physical_memory();
2800
2801 if (total_memory < (julong)256*M) {
2802 jio_fprintf(defaultStream::error_stream(),
2803 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2804 vm_exit(1);
2805 }
2806
2807 // The heap size is half of available memory, or (at most)
2808 // all of possible memory less 160mb (leaving room for the OS
2809 // when using ISM). This is the maximum; because adaptive sizing
2810 // is turned on below, the actual space used may be smaller.
2811
2812 initHeapSize = MIN2(total_memory / (julong)2,
2813 total_memory - (julong)160*M);
2814
2815 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2816
2817 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2818 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2819 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2820 // Currently the minimum size and the initial heap sizes are the same.
2821 set_min_heap_size(initHeapSize);
2822 }
2823 if (FLAG_IS_DEFAULT(NewSize)) {
2824 // Make the young generation 3/8ths of the total heap.
2825 FLAG_SET_CMDLINE(uintx, NewSize,
2826 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2827 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2828 }
2829
2830 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2831 FLAG_SET_DEFAULT(UseLargePages, true);
2832 #endif
2833
2834 // Increase some data structure sizes for efficiency
2835 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2836 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2837 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2838
2839 // See the OldPLABSize comment below, but replace 'after promotion'
2840 // with 'after copying'. YoungPLABSize is the size of the survivor
2841 // space per-gc-thread buffers. The default is 4kw.
2842 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2843
2844 // OldPLABSize is the size of the buffers in the old gen that
2845 // UseParallelGC uses to promote live data that doesn't fit in the
2846 // survivor spaces. At any given time, there's one for each gc thread.
2847 // The default size is 1kw. These buffers are rarely used, since the
2848 // survivor spaces are usually big enough. For specjbb, however, there
2849 // are occasions when there's lots of live data in the young gen
2850 // and we end up promoting some of it. We don't have a definite
2851 // explanation for why bumping OldPLABSize helps, but the theory
2852 // is that a bigger PLAB results in retaining something like the
2853 // original allocation order after promotion, which improves mutator
2854 // locality. A minor effect may be that larger PLABs reduce the
2855 // number of PLAB allocation events during gc. The value of 8kw
2856 // was arrived at by experimenting with specjbb.
2857 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2858
2859 // Enable parallel GC and adaptive generation sizing
2860 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2861 FLAG_SET_DEFAULT(ParallelGCThreads,
2862 Abstract_VM_Version::parallel_worker_threads());
2863
2864 // Encourage steady state memory management
2865 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2866
2867 // This appears to improve mutator locality
2868 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2869
2870 // Get around early Solaris scheduling bug
2871 // (affinity vs other jobs on system)
2872 // but disallow DR and offlining (5008695).
2873 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2874
2875 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2876 // The last option must always win.
2877 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2878 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2879 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2880 // The last option must always win.
2881 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2882 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2883 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2884 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2885 jio_fprintf(defaultStream::error_stream(),
2886 "Please use CMSClassUnloadingEnabled in place of "
2887 "CMSPermGenSweepingEnabled in the future\n");
2888 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2889 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2890 jio_fprintf(defaultStream::error_stream(),
2891 "Please use -XX:+UseGCOverheadLimit in place of "
2892 "-XX:+UseGCTimeLimit in the future\n");
2893 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2894 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2895 jio_fprintf(defaultStream::error_stream(),
2896 "Please use -XX:-UseGCOverheadLimit in place of "
2897 "-XX:-UseGCTimeLimit in the future\n");
2898 // The TLE options are for compatibility with 1.3 and will be
2899 // removed without notice in a future release. These options
2900 // are not to be documented.
2901 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2902 // No longer used.
2903 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2904 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2905 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2906 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2907 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2908 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2909 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2910 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2911 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2912 // No longer used.
2913 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2914 julong long_tlab_size = 0;
2915 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2916 if (errcode != arg_in_range) {
2917 jio_fprintf(defaultStream::error_stream(),
2918 "Invalid TLAB size: %s\n", option->optionString);
2919 describe_range_error(errcode);
2920 return JNI_EINVAL;
2921 }
2922 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2923 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2924 // No longer used.
2925 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2926 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2927 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2928 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2929 SOLARIS_ONLY(
2930 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2931 warning("-XX:+UsePermISM is obsolete.");
2932 FLAG_SET_CMDLINE(bool, UseISM, true);
2933 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2934 FLAG_SET_CMDLINE(bool, UseISM, false);
2935 )
2936 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2937 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2938 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2939 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2940 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2941 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2942 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2943 #if defined(DTRACE_ENABLED)
2944 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2945 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2946 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2947 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2948 #else // defined(DTRACE_ENABLED)
2949 jio_fprintf(defaultStream::error_stream(),
2950 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2951 return JNI_EINVAL;
2952 #endif // defined(DTRACE_ENABLED)
2953 #ifdef ASSERT
2954 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2955 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2956 // disable scavenge before parallel mark-compact
2957 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2958 #endif
2959 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2960 julong cms_blocks_to_claim = (julong)atol(tail);
2961 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2962 jio_fprintf(defaultStream::error_stream(),
2963 "Please use -XX:OldPLABSize in place of "
2964 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2965 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2966 julong cms_blocks_to_claim = (julong)atol(tail);
2967 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2968 jio_fprintf(defaultStream::error_stream(),
2969 "Please use -XX:OldPLABSize in place of "
2970 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2971 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2972 julong old_plab_size = 0;
2973 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2974 if (errcode != arg_in_range) {
2975 jio_fprintf(defaultStream::error_stream(),
2976 "Invalid old PLAB size: %s\n", option->optionString);
2977 describe_range_error(errcode);
2978 return JNI_EINVAL;
2979 }
2980 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2981 jio_fprintf(defaultStream::error_stream(),
2982 "Please use -XX:OldPLABSize in place of "
2983 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2984 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2985 julong young_plab_size = 0;
2986 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2987 if (errcode != arg_in_range) {
2988 jio_fprintf(defaultStream::error_stream(),
2989 "Invalid young PLAB size: %s\n", option->optionString);
2990 describe_range_error(errcode);
2991 return JNI_EINVAL;
2992 }
2993 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2994 jio_fprintf(defaultStream::error_stream(),
2995 "Please use -XX:YoungPLABSize in place of "
2996 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2997 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2998 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2999 julong stack_size = 0;
3000 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3001 if (errcode != arg_in_range) {
3002 jio_fprintf(defaultStream::error_stream(),
3003 "Invalid mark stack size: %s\n", option->optionString);
3004 describe_range_error(errcode);
3005 return JNI_EINVAL;
3006 }
3007 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3008 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3009 julong max_stack_size = 0;
3010 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3011 if (errcode != arg_in_range) {
3012 jio_fprintf(defaultStream::error_stream(),
3013 "Invalid maximum mark stack size: %s\n",
3014 option->optionString);
3015 describe_range_error(errcode);
3016 return JNI_EINVAL;
3017 }
3018 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3019 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3020 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3021 uintx conc_threads = 0;
3022 if (!parse_uintx(tail, &conc_threads, 1)) {
3023 jio_fprintf(defaultStream::error_stream(),
3024 "Invalid concurrent threads: %s\n", option->optionString);
3025 return JNI_EINVAL;
3026 }
3027 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3028 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3029 julong max_direct_memory_size = 0;
3030 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3031 if (errcode != arg_in_range) {
3032 jio_fprintf(defaultStream::error_stream(),
3033 "Invalid maximum direct memory size: %s\n",
3034 option->optionString);
3035 describe_range_error(errcode);
3036 return JNI_EINVAL;
3037 }
3038 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3039 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3040 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3041 // away and will cause VM initialization failures!
3042 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3043 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3044 #if !INCLUDE_MANAGEMENT
3045 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3046 jio_fprintf(defaultStream::error_stream(),
3047 "ManagementServer is not supported in this VM.\n");
3048 return JNI_ERR;
3049 #endif // INCLUDE_MANAGEMENT
3050 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3051 // Skip -XX:Flags= since that case has already been handled
3052 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3053 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3054 return JNI_EINVAL;
3055 }
3056 }
3057 // Unknown option
3058 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3059 return JNI_ERR;
3060 }
3061 }
3062
3063 // Change the default value for flags which have different default values
3064 // when working with older JDKs.
3065 #ifdef LINUX
3066 if (JDK_Version::current().compare_major(6) <= 0 &&
3067 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3068 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3069 }
3070 #endif // LINUX
3071 return JNI_OK;
3072 }
3073
3074 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3075 // This must be done after all -D arguments have been processed.
3076 scp_p->expand_endorsed();
3077
3078 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3079 // Assemble the bootclasspath elements into the final path.
3080 Arguments::set_sysclasspath(scp_p->combined_path());
3081 }
3082
3083 // This must be done after all arguments have been processed.
3084 // java_compiler() true means set to "NONE" or empty.
3085 if (java_compiler() && !xdebug_mode()) {
3086 // For backwards compatibility, we switch to interpreted mode if
3087 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3088 // not specified.
3089 set_mode_flags(_int);
3090 }
3091 if (CompileThreshold == 0) {
3092 set_mode_flags(_int);
3093 }
3094
3095 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3096 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3097 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3098 }
3099
3100 #ifndef COMPILER2
3101 // Don't degrade server performance for footprint
3102 if (FLAG_IS_DEFAULT(UseLargePages) &&
3103 MaxHeapSize < LargePageHeapSizeThreshold) {
3104 // No need for large granularity pages w/small heaps.
3105 // Note that large pages are enabled/disabled for both the
3106 // Java heap and the code cache.
3107 FLAG_SET_DEFAULT(UseLargePages, false);
3108 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
3109 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
3110 }
3111
3112 // Tiered compilation is undefined with C1.
3113 TieredCompilation = false;
3114 #else
3115 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3116 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3117 }
3118 #endif
3119
3120 // If we are running in a headless jre, force java.awt.headless property
3121 // to be true unless the property has already been set.
3122 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3123 if (os::is_headless_jre()) {
3124 const char* headless = Arguments::get_property("java.awt.headless");
3125 if (headless == NULL) {
3126 char envbuffer[128];
3127 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3128 if (!add_property("java.awt.headless=true")) {
3129 return JNI_ENOMEM;
3130 }
3131 } else {
3132 char buffer[256];
3133 strcpy(buffer, "java.awt.headless=");
3134 strcat(buffer, envbuffer);
3135 if (!add_property(buffer)) {
3136 return JNI_ENOMEM;
3137 }
3138 }
3139 }
3140 }
3141
3142 if (!check_vm_args_consistency()) {
3143 return JNI_ERR;
3144 }
3145
3146 return JNI_OK;
3147 }
3148
3149 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3150 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3151 scp_assembly_required_p);
3152 }
3153
3154 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3155 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3156 scp_assembly_required_p);
3157 }
3158
3159 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3160 const int N_MAX_OPTIONS = 64;
3161 const int OPTION_BUFFER_SIZE = 1024;
3162 char buffer[OPTION_BUFFER_SIZE];
3163
3164 // The variable will be ignored if it exceeds the length of the buffer.
3165 // Don't check this variable if user has special privileges
3166 // (e.g. unix su command).
3167 if (os::getenv(name, buffer, sizeof(buffer)) &&
3168 !os::have_special_privileges()) {
3169 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3170 jio_fprintf(defaultStream::error_stream(),
3171 "Picked up %s: %s\n", name, buffer);
3172 char* rd = buffer; // pointer to the input string (rd)
3173 int i;
3174 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3175 while (isspace(*rd)) rd++; // skip whitespace
3176 if (*rd == 0) break; // we re done when the input string is read completely
3177
3178 // The output, option string, overwrites the input string.
3179 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3180 // input string (rd).
3181 char* wrt = rd;
3182
3183 options[i++].optionString = wrt; // Fill in option
3184 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3185 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3186 int quote = *rd; // matching quote to look for
3187 rd++; // don't copy open quote
3188 while (*rd != quote) { // include everything (even spaces) up until quote
3189 if (*rd == 0) { // string termination means unmatched string
3190 jio_fprintf(defaultStream::error_stream(),
3191 "Unmatched quote in %s\n", name);
3192 return JNI_ERR;
3193 }
3194 *wrt++ = *rd++; // copy to option string
3195 }
3196 rd++; // don't copy close quote
3197 } else {
3198 *wrt++ = *rd++; // copy to option string
3199 }
3200 }
3201 // Need to check if we're done before writing a NULL,
3202 // because the write could be to the byte that rd is pointing to.
3203 if (*rd++ == 0) {
3204 *wrt = 0;
3205 break;
3206 }
3207 *wrt = 0; // Zero terminate option
3208 }
3209 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3210 JavaVMInitArgs vm_args;
3211 vm_args.version = JNI_VERSION_1_2;
3212 vm_args.options = options;
3213 vm_args.nOptions = i;
3214 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3215
3216 if (PrintVMOptions) {
3217 const char* tail;
3218 for (int i = 0; i < vm_args.nOptions; i++) {
3219 const JavaVMOption *option = vm_args.options + i;
3220 if (match_option(option, "-XX:", &tail)) {
3221 logOption(tail);
3222 }
3223 }
3224 }
3225
3226 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3227 }
3228 return JNI_OK;
3229 }
3230
3231 void Arguments::set_shared_spaces_flags() {
3232 #ifdef _LP64
3233 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3234
3235 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3236 // static fields are incorrect in the archive. With some more clever
3237 // initialization, this restriction can probably be lifted.
3238 if (UseCompressedOops) {
3239 if (must_share) {
3240 warning("disabling compressed oops because of %s",
3241 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3242 FLAG_SET_CMDLINE(bool, UseCompressedOops, false);
3243 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false);
3244 } else {
3245 // Prefer compressed oops to class data sharing
3246 if (UseSharedSpaces && Verbose) {
3247 warning("turning off use of shared archive because of compressed oops");
3248 }
3249 no_shared_spaces();
3250 }
3251 }
3252 #endif
3253
3254 if (DumpSharedSpaces) {
3255 if (RequireSharedSpaces) {
3256 warning("cannot dump shared archive while using shared archive");
3257 }
3258 UseSharedSpaces = false;
3259 }
3260 }
3261
3262 // Disable options not supported in this release, with a warning if they
3263 // were explicitly requested on the command-line
3264 #define UNSUPPORTED_OPTION(opt, description) \
3265 do { \
3266 if (opt) { \
3267 if (FLAG_IS_CMDLINE(opt)) { \
3268 warning(description " is disabled in this release."); \
3269 } \
3270 FLAG_SET_DEFAULT(opt, false); \
3271 } \
3272 } while(0)
3273
3274
3275 #define UNSUPPORTED_GC_OPTION(gc) \
3276 do { \
3277 if (gc) { \
3278 if (FLAG_IS_CMDLINE(gc)) { \
3279 warning(#gc " is not supported in this VM. Using Serial GC."); \
3280 } \
3281 FLAG_SET_DEFAULT(gc, false); \
3282 } \
3283 } while(0)
3284
3285 #if !INCLUDE_ALL_GCS
3286 static void force_serial_gc() {
3287 FLAG_SET_DEFAULT(UseSerialGC, true);
3288 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3289 UNSUPPORTED_GC_OPTION(UseG1GC);
3290 UNSUPPORTED_GC_OPTION(UseParallelGC);
3291 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3292 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3293 UNSUPPORTED_GC_OPTION(UseParNewGC);
3294 }
3295 #endif // INCLUDE_ALL_GCS
3296
3297 // Sharing support
3298 // Construct the path to the archive
3299 static char* get_shared_archive_path() {
3300 char *shared_archive_path;
3301 if (SharedArchiveFile == NULL) {
3302 char jvm_path[JVM_MAXPATHLEN];
3303 os::jvm_path(jvm_path, sizeof(jvm_path));
3304 char *end = strrchr(jvm_path, *os::file_separator());
3305 if (end != NULL) *end = '\0';
3306 size_t jvm_path_len = strlen(jvm_path);
3307 size_t file_sep_len = strlen(os::file_separator());
3308 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3309 file_sep_len + 20, mtInternal);
3310 if (shared_archive_path != NULL) {
3311 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3312 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3313 strncat(shared_archive_path, "classes.jsa", 11);
3314 }
3315 } else {
3316 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3317 if (shared_archive_path != NULL) {
3318 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3319 }
3320 }
3321 return shared_archive_path;
3322 }
3323
3324 // Parse entry point called from JNI_CreateJavaVM
3325
3326 jint Arguments::parse(const JavaVMInitArgs* args) {
3327
3328 // Remaining part of option string
3329 const char* tail;
3330
3331 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3332 const char* hotspotrc = ".hotspotrc";
3333 bool settings_file_specified = false;
3334 bool needs_hotspotrc_warning = false;
3335
3336 const char* flags_file;
3337 int index;
3338 for (index = 0; index < args->nOptions; index++) {
3339 const JavaVMOption *option = args->options + index;
3340 if (match_option(option, "-XX:Flags=", &tail)) {
3341 flags_file = tail;
3342 settings_file_specified = true;
3343 }
3344 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3345 PrintVMOptions = true;
3346 }
3347 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3348 PrintVMOptions = false;
3349 }
3350 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3351 IgnoreUnrecognizedVMOptions = true;
3352 }
3353 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3354 IgnoreUnrecognizedVMOptions = false;
3355 }
3356 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3357 CommandLineFlags::printFlags(tty, false);
3358 vm_exit(0);
3359 }
3360 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3361 #if INCLUDE_NMT
3362 MemTracker::init_tracking_options(tail);
3363 #else
3364 jio_fprintf(defaultStream::error_stream(),
3365 "Native Memory Tracking is not supported in this VM\n");
3366 return JNI_ERR;
3367 #endif
3368 }
3369
3370
3371 #ifndef PRODUCT
3372 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3373 CommandLineFlags::printFlags(tty, true);
3374 vm_exit(0);
3375 }
3376 #endif
3377 }
3378
3379 if (IgnoreUnrecognizedVMOptions) {
3380 // uncast const to modify the flag args->ignoreUnrecognized
3381 *(jboolean*)(&args->ignoreUnrecognized) = true;
3382 }
3383
3384 // Parse specified settings file
3385 if (settings_file_specified) {
3386 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3387 return JNI_EINVAL;
3388 }
3389 } else {
3390 #ifdef ASSERT
3391 // Parse default .hotspotrc settings file
3392 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3393 return JNI_EINVAL;
3394 }
3395 #else
3396 struct stat buf;
3397 if (os::stat(hotspotrc, &buf) == 0) {
3398 needs_hotspotrc_warning = true;
3399 }
3400 #endif
3401 }
3402
3403 if (PrintVMOptions) {
3404 for (index = 0; index < args->nOptions; index++) {
3405 const JavaVMOption *option = args->options + index;
3406 if (match_option(option, "-XX:", &tail)) {
3407 logOption(tail);
3408 }
3409 }
3410 }
3411
3412 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3413 jint result = parse_vm_init_args(args);
3414 if (result != JNI_OK) {
3415 return result;
3416 }
3417
3418 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3419 SharedArchivePath = get_shared_archive_path();
3420 if (SharedArchivePath == NULL) {
3421 return JNI_ENOMEM;
3422 }
3423
3424 // Delay warning until here so that we've had a chance to process
3425 // the -XX:-PrintWarnings flag
3426 if (needs_hotspotrc_warning) {
3427 warning("%s file is present but has been ignored. "
3428 "Run with -XX:Flags=%s to load the file.",
3429 hotspotrc, hotspotrc);
3430 }
3431
3432 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3433 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3434 #endif
3435
3436 #if INCLUDE_ALL_GCS
3437 #if (defined JAVASE_EMBEDDED || defined ARM)
3438 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3439 #endif
3440 #endif
3441
3442 #ifndef PRODUCT
3443 if (TraceBytecodesAt != 0) {
3444 TraceBytecodes = true;
3445 }
3446 if (CountCompiledCalls) {
3447 if (UseCounterDecay) {
3448 warning("UseCounterDecay disabled because CountCalls is set");
3449 UseCounterDecay = false;
3450 }
3451 }
3452 #endif // PRODUCT
3453
3454 // JSR 292 is not supported before 1.7
3455 if (!JDK_Version::is_gte_jdk17x_version()) {
3456 if (EnableInvokeDynamic) {
3457 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3458 warning("JSR 292 is not supported before 1.7. Disabling support.");
3459 }
3460 EnableInvokeDynamic = false;
3461 }
3462 }
3463
3464 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3465 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3466 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3467 }
3468 ScavengeRootsInCode = 1;
3469 }
3470
3471 if (PrintGCDetails) {
3472 // Turn on -verbose:gc options as well
3473 PrintGC = true;
3474 }
3475
3476 if (!JDK_Version::is_gte_jdk18x_version()) {
3477 // To avoid changing the log format for 7 updates this flag is only
3478 // true by default in JDK8 and above.
3479 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3480 FLAG_SET_DEFAULT(PrintGCCause, false);
3481 }
3482 }
3483
3484 // Set object alignment values.
3485 set_object_alignment();
3486
3487 #if !INCLUDE_ALL_GCS
3488 force_serial_gc();
3489 #endif // INCLUDE_ALL_GCS
3490 #if !INCLUDE_CDS
3491 if (DumpSharedSpaces || RequireSharedSpaces) {
3492 jio_fprintf(defaultStream::error_stream(),
3493 "Shared spaces are not supported in this VM\n");
3494 return JNI_ERR;
3495 }
3496 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3497 warning("Shared spaces are not supported in this VM");
3498 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3499 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3500 }
3501 no_shared_spaces();
3502 #endif // INCLUDE_CDS
3503
3504 // Set flags based on ergonomics.
3505 set_ergonomics_flags();
3506
3507 set_shared_spaces_flags();
3508
3509 // Check the GC selections again.
3510 if (!check_gc_consistency()) {
3511 return JNI_EINVAL;
3512 }
3513
3514 if (TieredCompilation) {
3515 set_tiered_flags();
3516 } else {
3517 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3518 if (CompilationPolicyChoice >= 2) {
3519 vm_exit_during_initialization(
3520 "Incompatible compilation policy selected", NULL);
3521 }
3522 }
3523
3524 // Set heap size based on available physical memory
3525 set_heap_size();
3526
3527 #if INCLUDE_ALL_GCS
3528 // Set per-collector flags
3529 if (UseParallelGC || UseParallelOldGC) {
3530 set_parallel_gc_flags();
3531 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3532 set_cms_and_parnew_gc_flags();
3533 } else if (UseParNewGC) { // skipped if CMS is set above
3534 set_parnew_gc_flags();
3535 } else if (UseG1GC) {
3536 set_g1_gc_flags();
3537 }
3538 check_deprecated_gcs();
3539 check_deprecated_gc_flags();
3540 if (AssumeMP && !UseSerialGC) {
3541 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3542 warning("If the number of processors is expected to increase from one, then"
3543 " you should configure the number of parallel GC threads appropriately"
3544 " using -XX:ParallelGCThreads=N");
3545 }
3546 }
3547 #else // INCLUDE_ALL_GCS
3548 assert(verify_serial_gc_flags(), "SerialGC unset");
3549 #endif // INCLUDE_ALL_GCS
3550
3551 // Set bytecode rewriting flags
3552 set_bytecode_flags();
3553
3554 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3555 set_aggressive_opts_flags();
3556
3557 // Turn off biased locking for locking debug mode flags,
3558 // which are subtlely different from each other but neither works with
3559 // biased locking.
3560 if (UseHeavyMonitors
3561 #ifdef COMPILER1
3562 || !UseFastLocking
3563 #endif // COMPILER1
3564 ) {
3565 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3566 // flag set to true on command line; warn the user that they
3567 // can't enable biased locking here
3568 warning("Biased Locking is not supported with locking debug flags"
3569 "; ignoring UseBiasedLocking flag." );
3570 }
3571 UseBiasedLocking = false;
3572 }
3573
3574 #ifdef CC_INTERP
3575 // Clear flags not supported by the C++ interpreter
3576 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3577 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3578 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3579 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3580 #endif // CC_INTERP
3581
3582 #ifdef COMPILER2
3583 if (!UseBiasedLocking || EmitSync != 0) {
3584 UseOptoBiasInlining = false;
3585 }
3586 if (!EliminateLocks) {
3587 EliminateNestedLocks = false;
3588 }
3589 if (!Inline) {
3590 IncrementalInline = false;
3591 }
3592 #ifndef PRODUCT
3593 if (!IncrementalInline) {
3594 AlwaysIncrementalInline = false;
3595 }
3596 #endif
3597 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3598 // incremental inlining: bump MaxNodeLimit
3599 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3600 }
3601 #endif
3602
3603 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3604 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3605 DebugNonSafepoints = true;
3606 }
3607
3608 #ifndef PRODUCT
3609 if (CompileTheWorld) {
3610 // Force NmethodSweeper to sweep whole CodeCache each time.
3611 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3612 NmethodSweepFraction = 1;
3613 }
3614 }
3615 #endif
3616
3617 if (PrintCommandLineFlags) {
3618 CommandLineFlags::printSetFlags(tty);
3619 }
3620
3621 // Apply CPU specific policy for the BiasedLocking
3622 if (UseBiasedLocking) {
3623 if (!VM_Version::use_biased_locking() &&
3624 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3625 UseBiasedLocking = false;
3626 }
3627 }
3628
3629 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3630 // but only if not already set on the commandline
3631 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3632 bool set = false;
3633 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3634 if (!set) {
3635 FLAG_SET_DEFAULT(PauseAtExit, true);
3636 }
3637 }
3638
3639 return JNI_OK;
3640 }
3641
3642 jint Arguments::adjust_after_os() {
3643 #if INCLUDE_ALL_GCS
3644 if (UseParallelGC || UseParallelOldGC) {
3645 if (UseNUMA) {
3646 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3647 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3648 }
3649 // For those collectors or operating systems (eg, Windows) that do
3650 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3651 UseNUMAInterleaving = true;
3652 }
3653 }
3654 #endif // INCLUDE_ALL_GCS
3655 return JNI_OK;
3656 }
3657
3658 int Arguments::PropertyList_count(SystemProperty* pl) {
3659 int count = 0;
3660 while(pl != NULL) {
3661 count++;
3662 pl = pl->next();
3663 }
3664 return count;
3665 }
3666
3667 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3668 assert(key != NULL, "just checking");
3669 SystemProperty* prop;
3670 for (prop = pl; prop != NULL; prop = prop->next()) {
3671 if (strcmp(key, prop->key()) == 0) return prop->value();
3672 }
3673 return NULL;
3674 }
3675
3676 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3677 int count = 0;
3678 const char* ret_val = NULL;
3679
3680 while(pl != NULL) {
3681 if(count >= index) {
3682 ret_val = pl->key();
3683 break;
3684 }
3685 count++;
3686 pl = pl->next();
3687 }
3688
3689 return ret_val;
3690 }
3691
3692 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3693 int count = 0;
3694 char* ret_val = NULL;
3695
3696 while(pl != NULL) {
3697 if(count >= index) {
3698 ret_val = pl->value();
3699 break;
3700 }
3701 count++;
3702 pl = pl->next();
3703 }
3704
3705 return ret_val;
3706 }
3707
3708 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3709 SystemProperty* p = *plist;
3710 if (p == NULL) {
3711 *plist = new_p;
3712 } else {
3713 while (p->next() != NULL) {
3714 p = p->next();
3715 }
3716 p->set_next(new_p);
3717 }
3718 }
3719
3720 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3721 if (plist == NULL)
3722 return;
3723
3724 SystemProperty* new_p = new SystemProperty(k, v, true);
3725 PropertyList_add(plist, new_p);
3726 }
3727
3728 // This add maintains unique property key in the list.
3729 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3730 if (plist == NULL)
3731 return;
3732
3733 // If property key exist then update with new value.
3734 SystemProperty* prop;
3735 for (prop = *plist; prop != NULL; prop = prop->next()) {
3736 if (strcmp(k, prop->key()) == 0) {
3737 if (append) {
3738 prop->append_value(v);
3739 } else {
3740 prop->set_value(v);
3741 }
3742 return;
3743 }
3744 }
3745
3746 PropertyList_add(plist, k, v);
3747 }
3748
3749 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3750 // Returns true if all of the source pointed by src has been copied over to
3751 // the destination buffer pointed by buf. Otherwise, returns false.
3752 // Notes:
3753 // 1. If the length (buflen) of the destination buffer excluding the
3754 // NULL terminator character is not long enough for holding the expanded
3755 // pid characters, it also returns false instead of returning the partially
3756 // expanded one.
3757 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3758 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3759 char* buf, size_t buflen) {
3760 const char* p = src;
3761 char* b = buf;
3762 const char* src_end = &src[srclen];
3763 char* buf_end = &buf[buflen - 1];
3764
3765 while (p < src_end && b < buf_end) {
3766 if (*p == '%') {
3767 switch (*(++p)) {
3768 case '%': // "%%" ==> "%"
3769 *b++ = *p++;
3770 break;
3771 case 'p': { // "%p" ==> current process id
3772 // buf_end points to the character before the last character so
3773 // that we could write '\0' to the end of the buffer.
3774 size_t buf_sz = buf_end - b + 1;
3775 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3776
3777 // if jio_snprintf fails or the buffer is not long enough to hold
3778 // the expanded pid, returns false.
3779 if (ret < 0 || ret >= (int)buf_sz) {
3780 return false;
3781 } else {
3782 b += ret;
3783 assert(*b == '\0', "fail in copy_expand_pid");
3784 if (p == src_end && b == buf_end + 1) {
3785 // reach the end of the buffer.
3786 return true;
3787 }
3788 }
3789 p++;
3790 break;
3791 }
3792 default :
3793 *b++ = '%';
3794 }
3795 } else {
3796 *b++ = *p++;
3797 }
3798 }
3799 *b = '\0';
3800 return (p == src_end); // return false if not all of the source was copied
3801 }