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 }
1093
1094 #if INCLUDE_ALL_GCS
1095 static void disable_adaptive_size_policy(const char* collector_name) {
1096 if (UseAdaptiveSizePolicy) {
1097 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1098 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1099 collector_name);
1100 }
1101 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1102 }
1103 }
1104
1105 void Arguments::set_parnew_gc_flags() {
1106 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1107 "control point invariant");
1108 assert(UseParNewGC, "Error");
1109
1110 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1111 disable_adaptive_size_policy("UseParNewGC");
1112
1113 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1114 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1115 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1116 } else if (ParallelGCThreads == 0) {
1117 jio_fprintf(defaultStream::error_stream(),
1118 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1119 vm_exit(1);
1120 }
1121
1122 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1123 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1124 // we set them to 1024 and 1024.
1125 // See CR 6362902.
1126 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1127 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1128 }
1129 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1130 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1131 }
1132
1133 // AlwaysTenure flag should make ParNew promote all at first collection.
1134 // See CR 6362902.
1135 if (AlwaysTenure) {
1136 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1137 }
1138 // When using compressed oops, we use local overflow stacks,
1139 // rather than using a global overflow list chained through
1140 // the klass word of the object's pre-image.
1141 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1142 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1143 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1144 }
1145 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1146 }
1147 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1148 }
1149
1150 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1151 // sparc/solaris for certain applications, but would gain from
1152 // further optimization and tuning efforts, and would almost
1153 // certainly gain from analysis of platform and environment.
1154 void Arguments::set_cms_and_parnew_gc_flags() {
1155 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1156 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1157
1158 // If we are using CMS, we prefer to UseParNewGC,
1159 // unless explicitly forbidden.
1160 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1161 FLAG_SET_ERGO(bool, UseParNewGC, true);
1162 }
1163
1164 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1165 disable_adaptive_size_policy("UseConcMarkSweepGC");
1166
1167 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1168 // as needed.
1169 if (UseParNewGC) {
1170 set_parnew_gc_flags();
1171 }
1172
1173 size_t max_heap = align_size_down(MaxHeapSize,
1174 CardTableRS::ct_max_alignment_constraint());
1175
1176 // Now make adjustments for CMS
1177 intx tenuring_default = (intx)6;
1178 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1179
1180 // Preferred young gen size for "short" pauses:
1181 // upper bound depends on # of threads and NewRatio.
1182 const uintx parallel_gc_threads =
1183 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1184 const size_t preferred_max_new_size_unaligned =
1185 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1186 size_t preferred_max_new_size =
1187 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1188
1189 // Unless explicitly requested otherwise, size young gen
1190 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1191
1192 // If either MaxNewSize or NewRatio is set on the command line,
1193 // assume the user is trying to set the size of the young gen.
1194 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1195
1196 // Set MaxNewSize to our calculated preferred_max_new_size unless
1197 // NewSize was set on the command line and it is larger than
1198 // preferred_max_new_size.
1199 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1200 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1201 } else {
1202 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1203 }
1204 if (PrintGCDetails && Verbose) {
1205 // Too early to use gclog_or_tty
1206 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1207 }
1208
1209 // Code along this path potentially sets NewSize and OldSize
1210 if (PrintGCDetails && Verbose) {
1211 // Too early to use gclog_or_tty
1212 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1213 " initial_heap_size: " SIZE_FORMAT
1214 " max_heap: " SIZE_FORMAT,
1215 min_heap_size(), InitialHeapSize, max_heap);
1216 }
1217 size_t min_new = preferred_max_new_size;
1218 if (FLAG_IS_CMDLINE(NewSize)) {
1219 min_new = NewSize;
1220 }
1221 if (max_heap > min_new && min_heap_size() > min_new) {
1222 // Unless explicitly requested otherwise, make young gen
1223 // at least min_new, and at most preferred_max_new_size.
1224 if (FLAG_IS_DEFAULT(NewSize)) {
1225 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1226 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1227 if (PrintGCDetails && Verbose) {
1228 // Too early to use gclog_or_tty
1229 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1230 }
1231 }
1232 // Unless explicitly requested otherwise, size old gen
1233 // so it's NewRatio x of NewSize.
1234 if (FLAG_IS_DEFAULT(OldSize)) {
1235 if (max_heap > NewSize) {
1236 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1237 if (PrintGCDetails && Verbose) {
1238 // Too early to use gclog_or_tty
1239 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1240 }
1241 }
1242 }
1243 }
1244 }
1245 // Unless explicitly requested otherwise, definitely
1246 // promote all objects surviving "tenuring_default" scavenges.
1247 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1248 FLAG_IS_DEFAULT(SurvivorRatio)) {
1249 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1250 }
1251 // If we decided above (or user explicitly requested)
1252 // `promote all' (via MaxTenuringThreshold := 0),
1253 // prefer minuscule survivor spaces so as not to waste
1254 // space for (non-existent) survivors
1255 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1256 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1257 }
1258 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1259 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1260 // This is done in order to make ParNew+CMS configuration to work
1261 // with YoungPLABSize and OldPLABSize options.
1262 // See CR 6362902.
1263 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1264 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1265 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1266 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1267 // the value (either from the command line or ergonomics) of
1268 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1269 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1270 } else {
1271 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1272 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1273 // we'll let it to take precedence.
1274 jio_fprintf(defaultStream::error_stream(),
1275 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1276 " options are specified for the CMS collector."
1277 " CMSParPromoteBlocksToClaim will take precedence.\n");
1278 }
1279 }
1280 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1281 // OldPLAB sizing manually turned off: Use a larger default setting,
1282 // unless it was manually specified. This is because a too-low value
1283 // will slow down scavenges.
1284 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1285 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1286 }
1287 }
1288 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1289 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1290 // If either of the static initialization defaults have changed, note this
1291 // modification.
1292 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1293 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1294 }
1295 if (PrintGCDetails && Verbose) {
1296 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1297 MarkStackSize / K, MarkStackSizeMax / K);
1298 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1299 }
1300 }
1301 #endif // INCLUDE_ALL_GCS
1302
1303 void set_object_alignment() {
1304 // Object alignment.
1305 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1306 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1307 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1308 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1309 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1310 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1311
1312 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1313 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1314
1315 // Oop encoding heap max
1316 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1317
1318 #if INCLUDE_ALL_GCS
1319 // Set CMS global values
1320 CompactibleFreeListSpace::set_cms_values();
1321 #endif // INCLUDE_ALL_GCS
1322 }
1323
1324 bool verify_object_alignment() {
1325 // Object alignment.
1326 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1327 jio_fprintf(defaultStream::error_stream(),
1328 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1329 (int)ObjectAlignmentInBytes);
1330 return false;
1331 }
1332 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1333 jio_fprintf(defaultStream::error_stream(),
1334 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1335 (int)ObjectAlignmentInBytes, BytesPerLong);
1336 return false;
1337 }
1338 // It does not make sense to have big object alignment
1339 // since a space lost due to alignment will be greater
1340 // then a saved space from compressed oops.
1341 if ((int)ObjectAlignmentInBytes > 256) {
1342 jio_fprintf(defaultStream::error_stream(),
1343 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1344 (int)ObjectAlignmentInBytes);
1345 return false;
1346 }
1347 // In case page size is very small.
1348 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1349 jio_fprintf(defaultStream::error_stream(),
1350 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1351 (int)ObjectAlignmentInBytes, os::vm_page_size());
1352 return false;
1353 }
1354 return true;
1355 }
1356
1357 inline uintx max_heap_for_compressed_oops() {
1358 // Avoid sign flip.
1359 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1360 return 0;
1361 }
1362 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1363 NOT_LP64(ShouldNotReachHere(); return 0);
1364 }
1365
1366 bool Arguments::should_auto_select_low_pause_collector() {
1367 if (UseAutoGCSelectPolicy &&
1368 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1369 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1370 if (PrintGCDetails) {
1371 // Cannot use gclog_or_tty yet.
1372 tty->print_cr("Automatic selection of the low pause collector"
1373 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1374 }
1375 return true;
1376 }
1377 return false;
1378 }
1379
1380 void Arguments::set_use_compressed_oops() {
1381 #ifndef ZERO
1382 #ifdef _LP64
1383 // MaxHeapSize is not set up properly at this point, but
1384 // the only value that can override MaxHeapSize if we are
1385 // to use UseCompressedOops is InitialHeapSize.
1386 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1387
1388 if (max_heap_size <= max_heap_for_compressed_oops()) {
1389 #if !defined(COMPILER1) || defined(TIERED)
1390 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1391 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1392 }
1393 #endif
1394 #ifdef _WIN64
1395 if (UseLargePages && UseCompressedOops) {
1396 // Cannot allocate guard pages for implicit checks in indexed addressing
1397 // mode, when large pages are specified on windows.
1398 // This flag could be switched ON if narrow oop base address is set to 0,
1399 // see code in Universe::initialize_heap().
1400 Universe::set_narrow_oop_use_implicit_null_checks(false);
1401 }
1402 #endif // _WIN64
1403 } else {
1404 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1405 warning("Max heap size too large for Compressed Oops");
1406 FLAG_SET_DEFAULT(UseCompressedOops, false);
1407 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1408 }
1409 }
1410 #endif // _LP64
1411 #endif // ZERO
1412 }
1413
1414 void Arguments::set_ergonomics_flags() {
1415
1416 if (os::is_server_class_machine()) {
1417 // If no other collector is requested explicitly,
1418 // let the VM select the collector based on
1419 // machine class and automatic selection policy.
1420 if (!UseSerialGC &&
1421 !UseConcMarkSweepGC &&
1422 !UseG1GC &&
1423 !UseParNewGC &&
1424 FLAG_IS_DEFAULT(UseParallelGC)) {
1425 if (should_auto_select_low_pause_collector()) {
1426 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1427 } else {
1428 FLAG_SET_ERGO(bool, UseParallelGC, true);
1429 }
1430 }
1431 // Shared spaces work fine with other GCs but causes bytecode rewriting
1432 // to be disabled, which hurts interpreter performance and decreases
1433 // server performance. On server class machines, keep the default
1434 // off unless it is asked for. Future work: either add bytecode rewriting
1435 // at link time, or rewrite bytecodes in non-shared methods.
1436 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1437 no_shared_spaces();
1438 }
1439 }
1440
1441 #ifndef ZERO
1442 #ifdef _LP64
1443 set_use_compressed_oops();
1444 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1445 if (!UseCompressedOops) {
1446 if (UseCompressedKlassPointers) {
1447 warning("UseCompressedKlassPointers requires UseCompressedOops");
1448 }
1449 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1450 } else {
1451 // Turn on UseCompressedKlassPointers too
1452 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1453 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1454 }
1455 // Set the ClassMetaspaceSize to something that will not need to be
1456 // expanded, since it cannot be expanded.
1457 if (UseCompressedKlassPointers) {
1458 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1459 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1460 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1461 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1462 // 100,000 classes seems like a good size, so 100M assumes around 1K
1463 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1464 // size per klass. Eventually, this will be parameterized because it
1465 // would also be useful to determine the optimal size of the
1466 // systemDictionary.
1467 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1468 }
1469 }
1470 }
1471 // Also checks that certain machines are slower with compressed oops
1472 // in vm_version initialization code.
1473 #endif // _LP64
1474 #endif // !ZERO
1475 }
1476
1477 void Arguments::set_parallel_gc_flags() {
1478 assert(UseParallelGC || UseParallelOldGC, "Error");
1479 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1480 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1481 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1482 }
1483 FLAG_SET_DEFAULT(UseParallelGC, true);
1484
1485 // If no heap maximum was requested explicitly, use some reasonable fraction
1486 // of the physical memory, up to a maximum of 1GB.
1487 FLAG_SET_DEFAULT(ParallelGCThreads,
1488 Abstract_VM_Version::parallel_worker_threads());
1489 if (ParallelGCThreads == 0) {
1490 jio_fprintf(defaultStream::error_stream(),
1491 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1492 vm_exit(1);
1493 }
1494
1495
1496 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1497 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1498 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1499 // See CR 6362902 for details.
1500 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1501 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1502 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1503 }
1504 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1505 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1506 }
1507 }
1508
1509 if (UseParallelOldGC) {
1510 // Par compact uses lower default values since they are treated as
1511 // minimums. These are different defaults because of the different
1512 // interpretation and are not ergonomically set.
1513 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1514 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1515 }
1516 }
1517 }
1518
1519 void Arguments::set_g1_gc_flags() {
1520 assert(UseG1GC, "Error");
1521 #ifdef COMPILER1
1522 FastTLABRefill = false;
1523 #endif
1524 FLAG_SET_DEFAULT(ParallelGCThreads,
1525 Abstract_VM_Version::parallel_worker_threads());
1526 if (ParallelGCThreads == 0) {
1527 FLAG_SET_DEFAULT(ParallelGCThreads,
1528 Abstract_VM_Version::parallel_worker_threads());
1529 }
1530
1531 // MarkStackSize will be set (if it hasn't been set by the user)
1532 // when concurrent marking is initialized.
1533 // Its value will be based upon the number of parallel marking threads.
1534 // But we do set the maximum mark stack size here.
1535 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1536 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1537 }
1538
1539 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1540 // In G1, we want the default GC overhead goal to be higher than
1541 // say in PS. So we set it here to 10%. Otherwise the heap might
1542 // be expanded more aggressively than we would like it to. In
1543 // fact, even 10% seems to not be high enough in some cases
1544 // (especially small GC stress tests that the main thing they do
1545 // is allocation). We might consider increase it further.
1546 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1547 }
1548
1549 if (PrintGCDetails && Verbose) {
1550 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1551 MarkStackSize / K, MarkStackSizeMax / K);
1552 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1553 }
1554 }
1555
1556 julong Arguments::limit_by_allocatable_memory(julong limit) {
1557 julong max_allocatable;
1558 julong result = limit;
1559 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1560 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1561 }
1562 return result;
1563 }
1564
1565 void Arguments::set_heap_size() {
1566 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1567 // Deprecated flag
1568 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1569 }
1570
1571 const julong phys_mem =
1572 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1573 : (julong)MaxRAM;
1574
1575 // If the maximum heap size has not been set with -Xmx,
1576 // then set it as fraction of the size of physical memory,
1577 // respecting the maximum and minimum sizes of the heap.
1578 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1579 julong reasonable_max = phys_mem / MaxRAMFraction;
1580
1581 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1582 // Small physical memory, so use a minimum fraction of it for the heap
1583 reasonable_max = phys_mem / MinRAMFraction;
1584 } else {
1585 // Not-small physical memory, so require a heap at least
1586 // as large as MaxHeapSize
1587 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1588 }
1589 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1590 // Limit the heap size to ErgoHeapSizeLimit
1591 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1592 }
1593 if (UseCompressedOops) {
1594 // Limit the heap size to the maximum possible when using compressed oops
1595 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1596 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1597 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1598 // but it should be not less than default MaxHeapSize.
1599 max_coop_heap -= HeapBaseMinAddress;
1600 }
1601 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1602 }
1603 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1604
1605 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1606 // An initial heap size was specified on the command line,
1607 // so be sure that the maximum size is consistent. Done
1608 // after call to limit_by_allocatable_memory because that
1609 // method might reduce the allocation size.
1610 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1611 }
1612
1613 if (PrintGCDetails && Verbose) {
1614 // Cannot use gclog_or_tty yet.
1615 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1616 }
1617 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1618 }
1619
1620 // If the minimum or initial heap_size have not been set or requested to be set
1621 // ergonomically, set them accordingly.
1622 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1623 julong reasonable_minimum = (julong)(OldSize + NewSize);
1624
1625 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1626
1627 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1628
1629 if (InitialHeapSize == 0) {
1630 julong reasonable_initial = phys_mem / InitialRAMFraction;
1631
1632 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1633 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1634
1635 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1636
1637 if (PrintGCDetails && Verbose) {
1638 // Cannot use gclog_or_tty yet.
1639 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1640 }
1641 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1642 }
1643 // If the minimum heap size has not been set (via -Xms),
1644 // synchronize with InitialHeapSize to avoid errors with the default value.
1645 if (min_heap_size() == 0) {
1646 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1647 if (PrintGCDetails && Verbose) {
1648 // Cannot use gclog_or_tty yet.
1649 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1650 }
1651 }
1652 }
1653 }
1654
1655 // This must be called after ergonomics because we want bytecode rewriting
1656 // if the server compiler is used, or if UseSharedSpaces is disabled.
1657 void Arguments::set_bytecode_flags() {
1658 // Better not attempt to store into a read-only space.
1659 if (UseSharedSpaces) {
1660 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1661 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1662 }
1663
1664 if (!RewriteBytecodes) {
1665 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1666 }
1667 }
1668
1669 // Aggressive optimization flags -XX:+AggressiveOpts
1670 void Arguments::set_aggressive_opts_flags() {
1671 #ifdef COMPILER2
1672 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1673 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1674 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1675 }
1676 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1677 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1678 }
1679
1680 // Feed the cache size setting into the JDK
1681 char buffer[1024];
1682 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1683 add_property(buffer);
1684 }
1685 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1686 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1687 }
1688 #endif
1689
1690 if (AggressiveOpts) {
1691 // Sample flag setting code
1692 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1693 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1694 // }
1695 }
1696 }
1697
1698 //===========================================================================================================
1699 // Parsing of java.compiler property
1700
1701 void Arguments::process_java_compiler_argument(char* arg) {
1702 // For backwards compatibility, Djava.compiler=NONE or ""
1703 // causes us to switch to -Xint mode UNLESS -Xdebug
1704 // is also specified.
1705 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1706 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1707 }
1708 }
1709
1710 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1711 _sun_java_launcher = strdup(launcher);
1712 if (strcmp("gamma", _sun_java_launcher) == 0) {
1713 _created_by_gamma_launcher = true;
1714 }
1715 }
1716
1717 bool Arguments::created_by_java_launcher() {
1718 assert(_sun_java_launcher != NULL, "property must have value");
1719 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1720 }
1721
1722 bool Arguments::created_by_gamma_launcher() {
1723 return _created_by_gamma_launcher;
1724 }
1725
1726 //===========================================================================================================
1727 // Parsing of main arguments
1728
1729 bool Arguments::verify_interval(uintx val, uintx min,
1730 uintx max, const char* name) {
1731 // Returns true iff value is in the inclusive interval [min..max]
1732 // false, otherwise.
1733 if (val >= min && val <= max) {
1734 return true;
1735 }
1736 jio_fprintf(defaultStream::error_stream(),
1737 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1738 " and " UINTX_FORMAT "\n",
1739 name, val, min, max);
1740 return false;
1741 }
1742
1743 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1744 // Returns true if given value is at least specified min threshold
1745 // false, otherwise.
1746 if (val >= min ) {
1747 return true;
1748 }
1749 jio_fprintf(defaultStream::error_stream(),
1750 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1751 name, val, min);
1752 return false;
1753 }
1754
1755 bool Arguments::verify_percentage(uintx value, const char* name) {
1756 if (value <= 100) {
1757 return true;
1758 }
1759 jio_fprintf(defaultStream::error_stream(),
1760 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1761 name, value);
1762 return false;
1763 }
1764
1765 #if !INCLUDE_ALL_GCS
1766 #ifdef ASSERT
1767 static bool verify_serial_gc_flags() {
1768 return (UseSerialGC &&
1769 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1770 UseParallelGC || UseParallelOldGC));
1771 }
1772 #endif // ASSERT
1773 #endif // INCLUDE_ALL_GCS
1774
1775 // check if do gclog rotation
1776 // +UseGCLogFileRotation is a must,
1777 // no gc log rotation when log file not supplied or
1778 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1779 void check_gclog_consistency() {
1780 if (UseGCLogFileRotation) {
1781 if ((Arguments::gc_log_filename() == NULL) ||
1782 (NumberOfGCLogFiles == 0) ||
1783 (GCLogFileSize == 0)) {
1784 jio_fprintf(defaultStream::output_stream(),
1785 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1786 "where num_of_file > 0 and num_of_size > 0\n"
1787 "GC log rotation is turned off\n");
1788 UseGCLogFileRotation = false;
1789 }
1790 }
1791
1792 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1793 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1794 jio_fprintf(defaultStream::output_stream(),
1795 "GCLogFileSize changed to minimum 8K\n");
1796 }
1797 }
1798
1799 // Check consistency of GC selection
1800 bool Arguments::check_gc_consistency() {
1801 check_gclog_consistency();
1802 bool status = true;
1803 // Ensure that the user has not selected conflicting sets
1804 // of collectors. [Note: this check is merely a user convenience;
1805 // collectors over-ride each other so that only a non-conflicting
1806 // set is selected; however what the user gets is not what they
1807 // may have expected from the combination they asked for. It's
1808 // better to reduce user confusion by not allowing them to
1809 // select conflicting combinations.
1810 uint i = 0;
1811 if (UseSerialGC) i++;
1812 if (UseConcMarkSweepGC || UseParNewGC) i++;
1813 if (UseParallelGC || UseParallelOldGC) i++;
1814 if (UseG1GC) i++;
1815 if (i > 1) {
1816 jio_fprintf(defaultStream::error_stream(),
1817 "Conflicting collector combinations in option list; "
1818 "please refer to the release notes for the combinations "
1819 "allowed\n");
1820 status = false;
1821 }
1822
1823 return status;
1824 }
1825
1826 void Arguments::check_deprecated_gcs() {
1827 if (UseConcMarkSweepGC && !UseParNewGC) {
1828 warning("Using the DefNew young collector with the CMS collector is deprecated "
1829 "and will likely be removed in a future release");
1830 }
1831
1832 if (UseParNewGC && !UseConcMarkSweepGC) {
1833 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1834 // set up UseSerialGC properly, so that can't be used in the check here.
1835 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1836 "and will likely be removed in a future release");
1837 }
1838
1839 if (CMSIncrementalMode) {
1840 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1841 }
1842 }
1843
1844 void Arguments::check_deprecated_gc_flags() {
1845 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1846 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1847 "and will likely be removed in future release");
1848 }
1849 }
1850
1851 // Check stack pages settings
1852 bool Arguments::check_stack_pages()
1853 {
1854 bool status = true;
1855 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1856 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1857 // greater stack shadow pages can't generate instruction to bang stack
1858 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1859 return status;
1860 }
1861
1862 // Check the consistency of vm_init_args
1863 bool Arguments::check_vm_args_consistency() {
1864 // Method for adding checks for flag consistency.
1865 // The intent is to warn the user of all possible conflicts,
1866 // before returning an error.
1867 // Note: Needs platform-dependent factoring.
1868 bool status = true;
1869
1870 #if ( (defined(COMPILER2) && defined(SPARC)))
1871 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1872 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1873 // x86. Normally, VM_Version_init must be called from init_globals in
1874 // init.cpp, which is called by the initial java thread *after* arguments
1875 // have been parsed. VM_Version_init gets called twice on sparc.
1876 extern void VM_Version_init();
1877 VM_Version_init();
1878 if (!VM_Version::has_v9()) {
1879 jio_fprintf(defaultStream::error_stream(),
1880 "V8 Machine detected, Server requires V9\n");
1881 status = false;
1882 }
1883 #endif /* COMPILER2 && SPARC */
1884
1885 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1886 // builds so the cost of stack banging can be measured.
1887 #if (defined(PRODUCT) && defined(SOLARIS))
1888 if (!UseBoundThreads && !UseStackBanging) {
1889 jio_fprintf(defaultStream::error_stream(),
1890 "-UseStackBanging conflicts with -UseBoundThreads\n");
1891
1892 status = false;
1893 }
1894 #endif
1895
1896 if (TLABRefillWasteFraction == 0) {
1897 jio_fprintf(defaultStream::error_stream(),
1898 "TLABRefillWasteFraction should be a denominator, "
1899 "not " SIZE_FORMAT "\n",
1900 TLABRefillWasteFraction);
1901 status = false;
1902 }
1903
1904 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1905 "AdaptiveSizePolicyWeight");
1906 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1907 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1908 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1909
1910 // Divide by bucket size to prevent a large size from causing rollover when
1911 // calculating amount of memory needed to be allocated for the String table.
1912 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1913 (max_uintx / StringTable::bucket_size()), "StringTable size");
1914
1915 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1916 jio_fprintf(defaultStream::error_stream(),
1917 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1918 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1919 MinHeapFreeRatio, MaxHeapFreeRatio);
1920 status = false;
1921 }
1922 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1923 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1924
1925 // Min/MaxMetaspaceFreeRatio
1926 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1927 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1928
1929 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1930 jio_fprintf(defaultStream::error_stream(),
1931 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1932 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1933 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1934 MinMetaspaceFreeRatio,
1935 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1936 MaxMetaspaceFreeRatio);
1937 status = false;
1938 }
1939
1940 // Trying to keep 100% free is not practical
1941 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1942
1943 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1944 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1945 }
1946
1947 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1948 // Settings to encourage splitting.
1949 if (!FLAG_IS_CMDLINE(NewRatio)) {
1950 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1951 }
1952 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1953 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1954 }
1955 }
1956
1957 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1958 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1959 if (GCTimeLimit == 100) {
1960 // Turn off gc-overhead-limit-exceeded checks
1961 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1962 }
1963
1964 status = status && check_gc_consistency();
1965 status = status && check_stack_pages();
1966
1967 if (_has_alloc_profile) {
1968 if (UseParallelGC || UseParallelOldGC) {
1969 jio_fprintf(defaultStream::error_stream(),
1970 "error: invalid argument combination.\n"
1971 "Allocation profiling (-Xaprof) cannot be used together with "
1972 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1973 status = false;
1974 }
1975 if (UseConcMarkSweepGC) {
1976 jio_fprintf(defaultStream::error_stream(),
1977 "error: invalid argument combination.\n"
1978 "Allocation profiling (-Xaprof) cannot be used together with "
1979 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1980 status = false;
1981 }
1982 }
1983
1984 if (CMSIncrementalMode) {
1985 if (!UseConcMarkSweepGC) {
1986 jio_fprintf(defaultStream::error_stream(),
1987 "error: invalid argument combination.\n"
1988 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1989 "selected in order\nto use CMSIncrementalMode.\n");
1990 status = false;
1991 } else {
1992 status = status && verify_percentage(CMSIncrementalDutyCycle,
1993 "CMSIncrementalDutyCycle");
1994 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1995 "CMSIncrementalDutyCycleMin");
1996 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1997 "CMSIncrementalSafetyFactor");
1998 status = status && verify_percentage(CMSIncrementalOffset,
1999 "CMSIncrementalOffset");
2000 status = status && verify_percentage(CMSExpAvgFactor,
2001 "CMSExpAvgFactor");
2002 // If it was not set on the command line, set
2003 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2004 if (CMSInitiatingOccupancyFraction < 0) {
2005 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2006 }
2007 }
2008 }
2009
2010 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2011 // insists that we hold the requisite locks so that the iteration is
2012 // MT-safe. For the verification at start-up and shut-down, we don't
2013 // yet have a good way of acquiring and releasing these locks,
2014 // which are not visible at the CollectedHeap level. We want to
2015 // be able to acquire these locks and then do the iteration rather
2016 // than just disable the lock verification. This will be fixed under
2017 // bug 4788986.
2018 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2019 if (VerifyDuringStartup) {
2020 warning("Heap verification at start-up disabled "
2021 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2022 VerifyDuringStartup = false; // Disable verification at start-up
2023 }
2024
2025 if (VerifyBeforeExit) {
2026 warning("Heap verification at shutdown disabled "
2027 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2028 VerifyBeforeExit = false; // Disable verification at shutdown
2029 }
2030 }
2031
2032 // Note: only executed in non-PRODUCT mode
2033 if (!UseAsyncConcMarkSweepGC &&
2034 (ExplicitGCInvokesConcurrent ||
2035 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2036 jio_fprintf(defaultStream::error_stream(),
2037 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2038 " with -UseAsyncConcMarkSweepGC");
2039 status = false;
2040 }
2041
2042 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2043
2044 #if INCLUDE_ALL_GCS
2045 if (UseG1GC) {
2046 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2047 "InitiatingHeapOccupancyPercent");
2048 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2049 "G1RefProcDrainInterval");
2050 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2051 "G1ConcMarkStepDurationMillis");
2052 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2053 "G1ConcRSHotCardLimit");
2054 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2055 "G1ConcRSLogCacheSize");
2056 }
2057 if (UseConcMarkSweepGC) {
2058 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2059 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2060 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2061 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2062
2063 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2064
2065 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2066 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2067 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2068
2069 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2070
2071 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2072 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2073
2074 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2075 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2076 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2077
2078 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2079
2080 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2081
2082 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2083 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2084 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2085 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2086 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2087 }
2088
2089 if (UseParallelGC || UseParallelOldGC) {
2090 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2091 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2092
2093 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2094 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2095
2096 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2097 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2098
2099 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2100
2101 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2102 }
2103 #endif // INCLUDE_ALL_GCS
2104
2105 status = status && verify_interval(RefDiscoveryPolicy,
2106 ReferenceProcessor::DiscoveryPolicyMin,
2107 ReferenceProcessor::DiscoveryPolicyMax,
2108 "RefDiscoveryPolicy");
2109
2110 // Limit the lower bound of this flag to 1 as it is used in a division
2111 // expression.
2112 status = status && verify_interval(TLABWasteTargetPercent,
2113 1, 100, "TLABWasteTargetPercent");
2114
2115 status = status && verify_object_alignment();
2116
2117 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2118 "ClassMetaspaceSize");
2119
2120 status = status && verify_interval(MarkStackSizeMax,
2121 1, (max_jint - 1), "MarkStackSizeMax");
2122 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2123
2124 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2125
2126 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2127
2128 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2129
2130 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2131 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2132
2133 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2134
2135 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2136 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2137 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2138 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2139
2140 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2141 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2142
2143 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2144 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2145 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2146
2147 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2148 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2149
2150 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2151 // just for that, so hardcode here.
2152 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2153 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2154 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2155 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2156
2157 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2158 #ifdef SPARC
2159 if (UseConcMarkSweepGC || UseG1GC) {
2160 // Issue a stern warning if the user has explicitly set
2161 // UseMemSetInBOT (it is known to cause issues), but allow
2162 // use for experimentation and debugging.
2163 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2164 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2165 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2166 " on sun4v; please understand that you are using at your own risk!");
2167 }
2168 }
2169 #endif // SPARC
2170
2171 if (PrintNMTStatistics) {
2172 #if INCLUDE_NMT
2173 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2174 #endif // INCLUDE_NMT
2175 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2176 PrintNMTStatistics = false;
2177 #if INCLUDE_NMT
2178 }
2179 #endif
2180 }
2181
2182 return status;
2183 }
2184
2185 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2186 const char* option_type) {
2187 if (ignore) return false;
2188
2189 const char* spacer = " ";
2190 if (option_type == NULL) {
2191 option_type = ++spacer; // Set both to the empty string.
2192 }
2193
2194 if (os::obsolete_option(option)) {
2195 jio_fprintf(defaultStream::error_stream(),
2196 "Obsolete %s%soption: %s\n", option_type, spacer,
2197 option->optionString);
2198 return false;
2199 } else {
2200 jio_fprintf(defaultStream::error_stream(),
2201 "Unrecognized %s%soption: %s\n", option_type, spacer,
2202 option->optionString);
2203 return true;
2204 }
2205 }
2206
2207 static const char* user_assertion_options[] = {
2208 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2209 };
2210
2211 static const char* system_assertion_options[] = {
2212 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2213 };
2214
2215 // Return true if any of the strings in null-terminated array 'names' matches.
2216 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2217 // the option must match exactly.
2218 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2219 bool tail_allowed) {
2220 for (/* empty */; *names != NULL; ++names) {
2221 if (match_option(option, *names, tail)) {
2222 if (**tail == '\0' || tail_allowed && **tail == ':') {
2223 return true;
2224 }
2225 }
2226 }
2227 return false;
2228 }
2229
2230 bool Arguments::parse_uintx(const char* value,
2231 uintx* uintx_arg,
2232 uintx min_size) {
2233
2234 // Check the sign first since atomull() parses only unsigned values.
2235 bool value_is_positive = !(*value == '-');
2236
2237 if (value_is_positive) {
2238 julong n;
2239 bool good_return = atomull(value, &n);
2240 if (good_return) {
2241 bool above_minimum = n >= min_size;
2242 bool value_is_too_large = n > max_uintx;
2243
2244 if (above_minimum && !value_is_too_large) {
2245 *uintx_arg = n;
2246 return true;
2247 }
2248 }
2249 }
2250 return false;
2251 }
2252
2253 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2254 julong* long_arg,
2255 julong min_size) {
2256 if (!atomull(s, long_arg)) return arg_unreadable;
2257 return check_memory_size(*long_arg, min_size);
2258 }
2259
2260 // Parse JavaVMInitArgs structure
2261
2262 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2263 // For components of the system classpath.
2264 SysClassPath scp(Arguments::get_sysclasspath());
2265 bool scp_assembly_required = false;
2266
2267 // Save default settings for some mode flags
2268 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2269 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2270 Arguments::_ClipInlining = ClipInlining;
2271 Arguments::_BackgroundCompilation = BackgroundCompilation;
2272
2273 // Setup flags for mixed which is the default
2274 set_mode_flags(_mixed);
2275
2276 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2277 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2278 if (result != JNI_OK) {
2279 return result;
2280 }
2281
2282 // Parse JavaVMInitArgs structure passed in
2283 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2284 if (result != JNI_OK) {
2285 return result;
2286 }
2287
2288 if (AggressiveOpts) {
2289 // Insert alt-rt.jar between user-specified bootclasspath
2290 // prefix and the default bootclasspath. os::set_boot_path()
2291 // uses meta_index_dir as the default bootclasspath directory.
2292 const char* altclasses_jar = "alt-rt.jar";
2293 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2294 strlen(altclasses_jar);
2295 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2296 strcpy(altclasses_path, get_meta_index_dir());
2297 strcat(altclasses_path, altclasses_jar);
2298 scp.add_suffix_to_prefix(altclasses_path);
2299 scp_assembly_required = true;
2300 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2301 }
2302
2303 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2304 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2305 if (result != JNI_OK) {
2306 return result;
2307 }
2308
2309 // Do final processing now that all arguments have been parsed
2310 result = finalize_vm_init_args(&scp, scp_assembly_required);
2311 if (result != JNI_OK) {
2312 return result;
2313 }
2314
2315 return JNI_OK;
2316 }
2317
2318 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2319 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2320 // are dealing with -agentpath (case where name is a path), otherwise with
2321 // -agentlib
2322 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2323 char *_name;
2324 const char *_hprof = "hprof", *_jdwp = "jdwp";
2325 size_t _len_hprof, _len_jdwp, _len_prefix;
2326
2327 if (is_path) {
2328 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2329 return false;
2330 }
2331
2332 _name++; // skip past last path separator
2333 _len_prefix = strlen(JNI_LIB_PREFIX);
2334
2335 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2336 return false;
2337 }
2338
2339 _name += _len_prefix;
2340 _len_hprof = strlen(_hprof);
2341 _len_jdwp = strlen(_jdwp);
2342
2343 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2344 _name += _len_hprof;
2345 }
2346 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2347 _name += _len_jdwp;
2348 }
2349 else {
2350 return false;
2351 }
2352
2353 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2354 return false;
2355 }
2356
2357 return true;
2358 }
2359
2360 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2361 return true;
2362 }
2363
2364 return false;
2365 }
2366
2367 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2368 SysClassPath* scp_p,
2369 bool* scp_assembly_required_p,
2370 FlagValueOrigin origin) {
2371 // Remaining part of option string
2372 const char* tail;
2373
2374 // iterate over arguments
2375 for (int index = 0; index < args->nOptions; index++) {
2376 bool is_absolute_path = false; // for -agentpath vs -agentlib
2377
2378 const JavaVMOption* option = args->options + index;
2379
2380 if (!match_option(option, "-Djava.class.path", &tail) &&
2381 !match_option(option, "-Dsun.java.command", &tail) &&
2382 !match_option(option, "-Dsun.java.launcher", &tail)) {
2383
2384 // add all jvm options to the jvm_args string. This string
2385 // is used later to set the java.vm.args PerfData string constant.
2386 // the -Djava.class.path and the -Dsun.java.command options are
2387 // omitted from jvm_args string as each have their own PerfData
2388 // string constant object.
2389 build_jvm_args(option->optionString);
2390 }
2391
2392 // -verbose:[class/gc/jni]
2393 if (match_option(option, "-verbose", &tail)) {
2394 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2395 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2396 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2397 } else if (!strcmp(tail, ":gc")) {
2398 FLAG_SET_CMDLINE(bool, PrintGC, true);
2399 } else if (!strcmp(tail, ":jni")) {
2400 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2401 }
2402 // -da / -ea / -disableassertions / -enableassertions
2403 // These accept an optional class/package name separated by a colon, e.g.,
2404 // -da:java.lang.Thread.
2405 } else if (match_option(option, user_assertion_options, &tail, true)) {
2406 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2407 if (*tail == '\0') {
2408 JavaAssertions::setUserClassDefault(enable);
2409 } else {
2410 assert(*tail == ':', "bogus match by match_option()");
2411 JavaAssertions::addOption(tail + 1, enable);
2412 }
2413 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2414 } else if (match_option(option, system_assertion_options, &tail, false)) {
2415 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2416 JavaAssertions::setSystemClassDefault(enable);
2417 // -bootclasspath:
2418 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2419 scp_p->reset_path(tail);
2420 *scp_assembly_required_p = true;
2421 // -bootclasspath/a:
2422 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2423 scp_p->add_suffix(tail);
2424 *scp_assembly_required_p = true;
2425 // -bootclasspath/p:
2426 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2427 scp_p->add_prefix(tail);
2428 *scp_assembly_required_p = true;
2429 // -Xrun
2430 } else if (match_option(option, "-Xrun", &tail)) {
2431 if (tail != NULL) {
2432 const char* pos = strchr(tail, ':');
2433 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2434 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2435 name[len] = '\0';
2436
2437 char *options = NULL;
2438 if(pos != NULL) {
2439 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2440 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2441 }
2442 #if !INCLUDE_JVMTI
2443 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2444 jio_fprintf(defaultStream::error_stream(),
2445 "Profiling and debugging agents are not supported in this VM\n");
2446 return JNI_ERR;
2447 }
2448 #endif // !INCLUDE_JVMTI
2449 add_init_library(name, options);
2450 }
2451 // -agentlib and -agentpath
2452 } else if (match_option(option, "-agentlib:", &tail) ||
2453 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2454 if(tail != NULL) {
2455 const char* pos = strchr(tail, '=');
2456 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2457 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2458 name[len] = '\0';
2459
2460 char *options = NULL;
2461 if(pos != NULL) {
2462 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2463 }
2464 #if !INCLUDE_JVMTI
2465 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2466 jio_fprintf(defaultStream::error_stream(),
2467 "Profiling and debugging agents are not supported in this VM\n");
2468 return JNI_ERR;
2469 }
2470 #endif // !INCLUDE_JVMTI
2471 add_init_agent(name, options, is_absolute_path);
2472 }
2473 // -javaagent
2474 } else if (match_option(option, "-javaagent:", &tail)) {
2475 #if !INCLUDE_JVMTI
2476 jio_fprintf(defaultStream::error_stream(),
2477 "Instrumentation agents are not supported in this VM\n");
2478 return JNI_ERR;
2479 #else
2480 if(tail != NULL) {
2481 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2482 add_init_agent("instrument", options, false);
2483 }
2484 #endif // !INCLUDE_JVMTI
2485 // -Xnoclassgc
2486 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2487 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2488 // -Xincgc: i-CMS
2489 } else if (match_option(option, "-Xincgc", &tail)) {
2490 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2491 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2492 // -Xnoincgc: no i-CMS
2493 } else if (match_option(option, "-Xnoincgc", &tail)) {
2494 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2495 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2496 // -Xconcgc
2497 } else if (match_option(option, "-Xconcgc", &tail)) {
2498 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2499 // -Xnoconcgc
2500 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2501 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2502 // -Xbatch
2503 } else if (match_option(option, "-Xbatch", &tail)) {
2504 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2505 // -Xmn for compatibility with other JVM vendors
2506 } else if (match_option(option, "-Xmn", &tail)) {
2507 julong long_initial_eden_size = 0;
2508 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2509 if (errcode != arg_in_range) {
2510 jio_fprintf(defaultStream::error_stream(),
2511 "Invalid initial eden size: %s\n", option->optionString);
2512 describe_range_error(errcode);
2513 return JNI_EINVAL;
2514 }
2515 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2516 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2517 // -Xms
2518 } else if (match_option(option, "-Xms", &tail)) {
2519 julong long_initial_heap_size = 0;
2520 // an initial heap size of 0 means automatically determine
2521 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2522 if (errcode != arg_in_range) {
2523 jio_fprintf(defaultStream::error_stream(),
2524 "Invalid initial heap size: %s\n", option->optionString);
2525 describe_range_error(errcode);
2526 return JNI_EINVAL;
2527 }
2528 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2529 // Currently the minimum size and the initial heap sizes are the same.
2530 set_min_heap_size(InitialHeapSize);
2531 // -Xmx
2532 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2533 julong long_max_heap_size = 0;
2534 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2535 if (errcode != arg_in_range) {
2536 jio_fprintf(defaultStream::error_stream(),
2537 "Invalid maximum heap size: %s\n", option->optionString);
2538 describe_range_error(errcode);
2539 return JNI_EINVAL;
2540 }
2541 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2542 // Xmaxf
2543 } else if (match_option(option, "-Xmaxf", &tail)) {
2544 int maxf = (int)(atof(tail) * 100);
2545 if (maxf < 0 || maxf > 100) {
2546 jio_fprintf(defaultStream::error_stream(),
2547 "Bad max heap free percentage size: %s\n",
2548 option->optionString);
2549 return JNI_EINVAL;
2550 } else {
2551 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2552 }
2553 // Xminf
2554 } else if (match_option(option, "-Xminf", &tail)) {
2555 int minf = (int)(atof(tail) * 100);
2556 if (minf < 0 || minf > 100) {
2557 jio_fprintf(defaultStream::error_stream(),
2558 "Bad min heap free percentage size: %s\n",
2559 option->optionString);
2560 return JNI_EINVAL;
2561 } else {
2562 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2563 }
2564 // -Xss
2565 } else if (match_option(option, "-Xss", &tail)) {
2566 julong long_ThreadStackSize = 0;
2567 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2568 if (errcode != arg_in_range) {
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Invalid thread stack size: %s\n", option->optionString);
2571 describe_range_error(errcode);
2572 return JNI_EINVAL;
2573 }
2574 // Internally track ThreadStackSize in units of 1024 bytes.
2575 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2576 round_to((int)long_ThreadStackSize, K) / K);
2577 // -Xoss
2578 } else if (match_option(option, "-Xoss", &tail)) {
2579 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2580 // -Xmaxjitcodesize
2581 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2582 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2583 julong long_ReservedCodeCacheSize = 0;
2584 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2585 (size_t)InitialCodeCacheSize);
2586 if (errcode != arg_in_range) {
2587 jio_fprintf(defaultStream::error_stream(),
2588 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2589 option->optionString, InitialCodeCacheSize/K);
2590 describe_range_error(errcode);
2591 return JNI_EINVAL;
2592 }
2593 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2594 // -green
2595 } else if (match_option(option, "-green", &tail)) {
2596 jio_fprintf(defaultStream::error_stream(),
2597 "Green threads support not available\n");
2598 return JNI_EINVAL;
2599 // -native
2600 } else if (match_option(option, "-native", &tail)) {
2601 // HotSpot always uses native threads, ignore silently for compatibility
2602 // -Xsqnopause
2603 } else if (match_option(option, "-Xsqnopause", &tail)) {
2604 // EVM option, ignore silently for compatibility
2605 // -Xrs
2606 } else if (match_option(option, "-Xrs", &tail)) {
2607 // Classic/EVM option, new functionality
2608 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2609 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2610 // change default internal VM signals used - lower case for back compat
2611 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2612 // -Xoptimize
2613 } else if (match_option(option, "-Xoptimize", &tail)) {
2614 // EVM option, ignore silently for compatibility
2615 // -Xprof
2616 } else if (match_option(option, "-Xprof", &tail)) {
2617 #if INCLUDE_FPROF
2618 _has_profile = true;
2619 #else // INCLUDE_FPROF
2620 jio_fprintf(defaultStream::error_stream(),
2621 "Flat profiling is not supported in this VM.\n");
2622 return JNI_ERR;
2623 #endif // INCLUDE_FPROF
2624 // -Xaprof
2625 } else if (match_option(option, "-Xaprof", &tail)) {
2626 _has_alloc_profile = true;
2627 // -Xconcurrentio
2628 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2629 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2630 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2631 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2632 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2633 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2634
2635 // -Xinternalversion
2636 } else if (match_option(option, "-Xinternalversion", &tail)) {
2637 jio_fprintf(defaultStream::output_stream(), "%s\n",
2638 VM_Version::internal_vm_info_string());
2639 vm_exit(0);
2640 #ifndef PRODUCT
2641 // -Xprintflags
2642 } else if (match_option(option, "-Xprintflags", &tail)) {
2643 CommandLineFlags::printFlags(tty, false);
2644 vm_exit(0);
2645 #endif
2646 // -D
2647 } else if (match_option(option, "-D", &tail)) {
2648 if (!add_property(tail)) {
2649 return JNI_ENOMEM;
2650 }
2651 // Out of the box management support
2652 if (match_option(option, "-Dcom.sun.management", &tail)) {
2653 #if INCLUDE_MANAGEMENT
2654 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2655 #else
2656 jio_fprintf(defaultStream::output_stream(),
2657 "-Dcom.sun.management is not supported in this VM.\n");
2658 return JNI_ERR;
2659 #endif
2660 }
2661 // -Xint
2662 } else if (match_option(option, "-Xint", &tail)) {
2663 set_mode_flags(_int);
2664 // -Xmixed
2665 } else if (match_option(option, "-Xmixed", &tail)) {
2666 set_mode_flags(_mixed);
2667 // -Xcomp
2668 } else if (match_option(option, "-Xcomp", &tail)) {
2669 // for testing the compiler; turn off all flags that inhibit compilation
2670 set_mode_flags(_comp);
2671 // -Xshare:dump
2672 } else if (match_option(option, "-Xshare:dump", &tail)) {
2673 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2674 set_mode_flags(_int); // Prevent compilation, which creates objects
2675 // -Xshare:on
2676 } else if (match_option(option, "-Xshare:on", &tail)) {
2677 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2678 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2679 // -Xshare:auto
2680 } else if (match_option(option, "-Xshare:auto", &tail)) {
2681 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2682 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2683 // -Xshare:off
2684 } else if (match_option(option, "-Xshare:off", &tail)) {
2685 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2686 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2687 // -Xverify
2688 } else if (match_option(option, "-Xverify", &tail)) {
2689 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2690 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2691 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2692 } else if (strcmp(tail, ":remote") == 0) {
2693 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2694 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2695 } else if (strcmp(tail, ":none") == 0) {
2696 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2697 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2698 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2699 return JNI_EINVAL;
2700 }
2701 // -Xdebug
2702 } else if (match_option(option, "-Xdebug", &tail)) {
2703 // note this flag has been used, then ignore
2704 set_xdebug_mode(true);
2705 // -Xnoagent
2706 } else if (match_option(option, "-Xnoagent", &tail)) {
2707 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2708 } else if (match_option(option, "-Xboundthreads", &tail)) {
2709 // Bind user level threads to kernel threads (Solaris only)
2710 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2711 } else if (match_option(option, "-Xloggc:", &tail)) {
2712 // Redirect GC output to the file. -Xloggc:<filename>
2713 // ostream_init_log(), when called will use this filename
2714 // to initialize a fileStream.
2715 _gc_log_filename = strdup(tail);
2716 FLAG_SET_CMDLINE(bool, PrintGC, true);
2717 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2718
2719 // JNI hooks
2720 } else if (match_option(option, "-Xcheck", &tail)) {
2721 if (!strcmp(tail, ":jni")) {
2722 #if !INCLUDE_JNI_CHECK
2723 warning("JNI CHECKING is not supported in this VM");
2724 #else
2725 CheckJNICalls = true;
2726 #endif // INCLUDE_JNI_CHECK
2727 } else if (is_bad_option(option, args->ignoreUnrecognized,
2728 "check")) {
2729 return JNI_EINVAL;
2730 }
2731 } else if (match_option(option, "vfprintf", &tail)) {
2732 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2733 } else if (match_option(option, "exit", &tail)) {
2734 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2735 } else if (match_option(option, "abort", &tail)) {
2736 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2737 // -XX:+AggressiveHeap
2738 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2739
2740 // This option inspects the machine and attempts to set various
2741 // parameters to be optimal for long-running, memory allocation
2742 // intensive jobs. It is intended for machines with large
2743 // amounts of cpu and memory.
2744
2745 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2746 // VM, but we may not be able to represent the total physical memory
2747 // available (like having 8gb of memory on a box but using a 32bit VM).
2748 // Thus, we need to make sure we're using a julong for intermediate
2749 // calculations.
2750 julong initHeapSize;
2751 julong total_memory = os::physical_memory();
2752
2753 if (total_memory < (julong)256*M) {
2754 jio_fprintf(defaultStream::error_stream(),
2755 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2756 vm_exit(1);
2757 }
2758
2759 // The heap size is half of available memory, or (at most)
2760 // all of possible memory less 160mb (leaving room for the OS
2761 // when using ISM). This is the maximum; because adaptive sizing
2762 // is turned on below, the actual space used may be smaller.
2763
2764 initHeapSize = MIN2(total_memory / (julong)2,
2765 total_memory - (julong)160*M);
2766
2767 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2768
2769 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2770 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2771 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2772 // Currently the minimum size and the initial heap sizes are the same.
2773 set_min_heap_size(initHeapSize);
2774 }
2775 if (FLAG_IS_DEFAULT(NewSize)) {
2776 // Make the young generation 3/8ths of the total heap.
2777 FLAG_SET_CMDLINE(uintx, NewSize,
2778 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2779 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2780 }
2781
2782 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2783 FLAG_SET_DEFAULT(UseLargePages, true);
2784 #endif
2785
2786 // Increase some data structure sizes for efficiency
2787 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2788 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2789 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2790
2791 // See the OldPLABSize comment below, but replace 'after promotion'
2792 // with 'after copying'. YoungPLABSize is the size of the survivor
2793 // space per-gc-thread buffers. The default is 4kw.
2794 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2795
2796 // OldPLABSize is the size of the buffers in the old gen that
2797 // UseParallelGC uses to promote live data that doesn't fit in the
2798 // survivor spaces. At any given time, there's one for each gc thread.
2799 // The default size is 1kw. These buffers are rarely used, since the
2800 // survivor spaces are usually big enough. For specjbb, however, there
2801 // are occasions when there's lots of live data in the young gen
2802 // and we end up promoting some of it. We don't have a definite
2803 // explanation for why bumping OldPLABSize helps, but the theory
2804 // is that a bigger PLAB results in retaining something like the
2805 // original allocation order after promotion, which improves mutator
2806 // locality. A minor effect may be that larger PLABs reduce the
2807 // number of PLAB allocation events during gc. The value of 8kw
2808 // was arrived at by experimenting with specjbb.
2809 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2810
2811 // Enable parallel GC and adaptive generation sizing
2812 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2813 FLAG_SET_DEFAULT(ParallelGCThreads,
2814 Abstract_VM_Version::parallel_worker_threads());
2815
2816 // Encourage steady state memory management
2817 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2818
2819 // This appears to improve mutator locality
2820 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2821
2822 // Get around early Solaris scheduling bug
2823 // (affinity vs other jobs on system)
2824 // but disallow DR and offlining (5008695).
2825 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2826
2827 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2828 // The last option must always win.
2829 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2830 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2831 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2832 // The last option must always win.
2833 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2834 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2835 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2836 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2837 jio_fprintf(defaultStream::error_stream(),
2838 "Please use CMSClassUnloadingEnabled in place of "
2839 "CMSPermGenSweepingEnabled in the future\n");
2840 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2841 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Please use -XX:+UseGCOverheadLimit in place of "
2844 "-XX:+UseGCTimeLimit in the future\n");
2845 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2846 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2847 jio_fprintf(defaultStream::error_stream(),
2848 "Please use -XX:-UseGCOverheadLimit in place of "
2849 "-XX:-UseGCTimeLimit in the future\n");
2850 // The TLE options are for compatibility with 1.3 and will be
2851 // removed without notice in a future release. These options
2852 // are not to be documented.
2853 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2854 // No longer used.
2855 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2856 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2857 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2858 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2859 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2860 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2861 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2862 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2863 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2864 // No longer used.
2865 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2866 julong long_tlab_size = 0;
2867 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2868 if (errcode != arg_in_range) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Invalid TLAB size: %s\n", option->optionString);
2871 describe_range_error(errcode);
2872 return JNI_EINVAL;
2873 }
2874 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2875 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2876 // No longer used.
2877 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2878 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2879 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2880 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2881 SOLARIS_ONLY(
2882 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2883 warning("-XX:+UsePermISM is obsolete.");
2884 FLAG_SET_CMDLINE(bool, UseISM, true);
2885 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2886 FLAG_SET_CMDLINE(bool, UseISM, false);
2887 )
2888 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2889 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2890 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2891 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2892 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2893 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2894 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2895 #if defined(DTRACE_ENABLED)
2896 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2897 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2898 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2899 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2900 #else // defined(DTRACE_ENABLED)
2901 jio_fprintf(defaultStream::error_stream(),
2902 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2903 return JNI_EINVAL;
2904 #endif // defined(DTRACE_ENABLED)
2905 #ifdef ASSERT
2906 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2907 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2908 // disable scavenge before parallel mark-compact
2909 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2910 #endif
2911 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2912 julong cms_blocks_to_claim = (julong)atol(tail);
2913 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2914 jio_fprintf(defaultStream::error_stream(),
2915 "Please use -XX:OldPLABSize in place of "
2916 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2917 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2918 julong cms_blocks_to_claim = (julong)atol(tail);
2919 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2920 jio_fprintf(defaultStream::error_stream(),
2921 "Please use -XX:OldPLABSize in place of "
2922 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2923 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2924 julong old_plab_size = 0;
2925 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2926 if (errcode != arg_in_range) {
2927 jio_fprintf(defaultStream::error_stream(),
2928 "Invalid old PLAB size: %s\n", option->optionString);
2929 describe_range_error(errcode);
2930 return JNI_EINVAL;
2931 }
2932 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2933 jio_fprintf(defaultStream::error_stream(),
2934 "Please use -XX:OldPLABSize in place of "
2935 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2936 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2937 julong young_plab_size = 0;
2938 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2939 if (errcode != arg_in_range) {
2940 jio_fprintf(defaultStream::error_stream(),
2941 "Invalid young PLAB size: %s\n", option->optionString);
2942 describe_range_error(errcode);
2943 return JNI_EINVAL;
2944 }
2945 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2946 jio_fprintf(defaultStream::error_stream(),
2947 "Please use -XX:YoungPLABSize in place of "
2948 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2949 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2950 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2951 julong stack_size = 0;
2952 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2953 if (errcode != arg_in_range) {
2954 jio_fprintf(defaultStream::error_stream(),
2955 "Invalid mark stack size: %s\n", option->optionString);
2956 describe_range_error(errcode);
2957 return JNI_EINVAL;
2958 }
2959 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2960 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2961 julong max_stack_size = 0;
2962 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2963 if (errcode != arg_in_range) {
2964 jio_fprintf(defaultStream::error_stream(),
2965 "Invalid maximum mark stack size: %s\n",
2966 option->optionString);
2967 describe_range_error(errcode);
2968 return JNI_EINVAL;
2969 }
2970 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2971 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2972 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2973 uintx conc_threads = 0;
2974 if (!parse_uintx(tail, &conc_threads, 1)) {
2975 jio_fprintf(defaultStream::error_stream(),
2976 "Invalid concurrent threads: %s\n", option->optionString);
2977 return JNI_EINVAL;
2978 }
2979 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2980 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2981 julong max_direct_memory_size = 0;
2982 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2983 if (errcode != arg_in_range) {
2984 jio_fprintf(defaultStream::error_stream(),
2985 "Invalid maximum direct memory size: %s\n",
2986 option->optionString);
2987 describe_range_error(errcode);
2988 return JNI_EINVAL;
2989 }
2990 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2991 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2992 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2993 // away and will cause VM initialization failures!
2994 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2995 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2996 #if !INCLUDE_MANAGEMENT
2997 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
2998 jio_fprintf(defaultStream::error_stream(),
2999 "ManagementServer is not supported in this VM.\n");
3000 return JNI_ERR;
3001 #endif // INCLUDE_MANAGEMENT
3002 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3003 // Skip -XX:Flags= since that case has already been handled
3004 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3005 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3006 return JNI_EINVAL;
3007 }
3008 }
3009 // Unknown option
3010 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3011 return JNI_ERR;
3012 }
3013 }
3014
3015 // Change the default value for flags which have different default values
3016 // when working with older JDKs.
3017 #ifdef LINUX
3018 if (JDK_Version::current().compare_major(6) <= 0 &&
3019 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3020 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3021 }
3022 #endif // LINUX
3023 return JNI_OK;
3024 }
3025
3026 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3027 // This must be done after all -D arguments have been processed.
3028 scp_p->expand_endorsed();
3029
3030 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3031 // Assemble the bootclasspath elements into the final path.
3032 Arguments::set_sysclasspath(scp_p->combined_path());
3033 }
3034
3035 // This must be done after all arguments have been processed.
3036 // java_compiler() true means set to "NONE" or empty.
3037 if (java_compiler() && !xdebug_mode()) {
3038 // For backwards compatibility, we switch to interpreted mode if
3039 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3040 // not specified.
3041 set_mode_flags(_int);
3042 }
3043 if (CompileThreshold == 0) {
3044 set_mode_flags(_int);
3045 }
3046
3047 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3048 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3049 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3050 }
3051
3052 #ifndef COMPILER2
3053 // Don't degrade server performance for footprint
3054 if (FLAG_IS_DEFAULT(UseLargePages) &&
3055 MaxHeapSize < LargePageHeapSizeThreshold) {
3056 // No need for large granularity pages w/small heaps.
3057 // Note that large pages are enabled/disabled for both the
3058 // Java heap and the code cache.
3059 FLAG_SET_DEFAULT(UseLargePages, false);
3060 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
3061 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
3062 }
3063
3064 // Tiered compilation is undefined with C1.
3065 TieredCompilation = false;
3066 #else
3067 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3068 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3069 }
3070 #endif
3071
3072 // If we are running in a headless jre, force java.awt.headless property
3073 // to be true unless the property has already been set.
3074 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3075 if (os::is_headless_jre()) {
3076 const char* headless = Arguments::get_property("java.awt.headless");
3077 if (headless == NULL) {
3078 char envbuffer[128];
3079 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3080 if (!add_property("java.awt.headless=true")) {
3081 return JNI_ENOMEM;
3082 }
3083 } else {
3084 char buffer[256];
3085 strcpy(buffer, "java.awt.headless=");
3086 strcat(buffer, envbuffer);
3087 if (!add_property(buffer)) {
3088 return JNI_ENOMEM;
3089 }
3090 }
3091 }
3092 }
3093
3094 if (!check_vm_args_consistency()) {
3095 return JNI_ERR;
3096 }
3097
3098 return JNI_OK;
3099 }
3100
3101 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3102 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3103 scp_assembly_required_p);
3104 }
3105
3106 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3107 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3108 scp_assembly_required_p);
3109 }
3110
3111 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3112 const int N_MAX_OPTIONS = 64;
3113 const int OPTION_BUFFER_SIZE = 1024;
3114 char buffer[OPTION_BUFFER_SIZE];
3115
3116 // The variable will be ignored if it exceeds the length of the buffer.
3117 // Don't check this variable if user has special privileges
3118 // (e.g. unix su command).
3119 if (os::getenv(name, buffer, sizeof(buffer)) &&
3120 !os::have_special_privileges()) {
3121 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3122 jio_fprintf(defaultStream::error_stream(),
3123 "Picked up %s: %s\n", name, buffer);
3124 char* rd = buffer; // pointer to the input string (rd)
3125 int i;
3126 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3127 while (isspace(*rd)) rd++; // skip whitespace
3128 if (*rd == 0) break; // we re done when the input string is read completely
3129
3130 // The output, option string, overwrites the input string.
3131 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3132 // input string (rd).
3133 char* wrt = rd;
3134
3135 options[i++].optionString = wrt; // Fill in option
3136 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3137 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3138 int quote = *rd; // matching quote to look for
3139 rd++; // don't copy open quote
3140 while (*rd != quote) { // include everything (even spaces) up until quote
3141 if (*rd == 0) { // string termination means unmatched string
3142 jio_fprintf(defaultStream::error_stream(),
3143 "Unmatched quote in %s\n", name);
3144 return JNI_ERR;
3145 }
3146 *wrt++ = *rd++; // copy to option string
3147 }
3148 rd++; // don't copy close quote
3149 } else {
3150 *wrt++ = *rd++; // copy to option string
3151 }
3152 }
3153 // Need to check if we're done before writing a NULL,
3154 // because the write could be to the byte that rd is pointing to.
3155 if (*rd++ == 0) {
3156 *wrt = 0;
3157 break;
3158 }
3159 *wrt = 0; // Zero terminate option
3160 }
3161 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3162 JavaVMInitArgs vm_args;
3163 vm_args.version = JNI_VERSION_1_2;
3164 vm_args.options = options;
3165 vm_args.nOptions = i;
3166 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3167
3168 if (PrintVMOptions) {
3169 const char* tail;
3170 for (int i = 0; i < vm_args.nOptions; i++) {
3171 const JavaVMOption *option = vm_args.options + i;
3172 if (match_option(option, "-XX:", &tail)) {
3173 logOption(tail);
3174 }
3175 }
3176 }
3177
3178 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3179 }
3180 return JNI_OK;
3181 }
3182
3183 void Arguments::set_shared_spaces_flags() {
3184 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3185 const bool might_share = must_share || UseSharedSpaces;
3186
3187 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3188 // static fields are incorrect in the archive. With some more clever
3189 // initialization, this restriction can probably be lifted.
3190 // ??? UseLargePages might be okay now
3191 const bool cannot_share = UseCompressedOops ||
3192 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
3193 if (cannot_share) {
3194 if (must_share) {
3195 warning("disabling large pages %s"
3196 "because of %s", "" LP64_ONLY("and compressed oops "),
3197 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3198 FLAG_SET_CMDLINE(bool, UseLargePages, false);
3199 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
3200 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
3201 } else {
3202 // Prefer compressed oops and large pages to class data sharing
3203 if (UseSharedSpaces && Verbose) {
3204 warning("turning off use of shared archive because of large pages%s",
3205 "" LP64_ONLY(" and/or compressed oops"));
3206 }
3207 no_shared_spaces();
3208 }
3209 } else if (UseLargePages && might_share) {
3210 // Disable large pages to allow shared spaces. This is sub-optimal, since
3211 // there may not even be a shared archive to use.
3212 FLAG_SET_DEFAULT(UseLargePages, false);
3213 }
3214
3215 if (DumpSharedSpaces) {
3216 if (RequireSharedSpaces) {
3217 warning("cannot dump shared archive while using shared archive");
3218 }
3219 UseSharedSpaces = false;
3220 }
3221 }
3222
3223 // Disable options not supported in this release, with a warning if they
3224 // were explicitly requested on the command-line
3225 #define UNSUPPORTED_OPTION(opt, description) \
3226 do { \
3227 if (opt) { \
3228 if (FLAG_IS_CMDLINE(opt)) { \
3229 warning(description " is disabled in this release."); \
3230 } \
3231 FLAG_SET_DEFAULT(opt, false); \
3232 } \
3233 } while(0)
3234
3235
3236 #define UNSUPPORTED_GC_OPTION(gc) \
3237 do { \
3238 if (gc) { \
3239 if (FLAG_IS_CMDLINE(gc)) { \
3240 warning(#gc " is not supported in this VM. Using Serial GC."); \
3241 } \
3242 FLAG_SET_DEFAULT(gc, false); \
3243 } \
3244 } while(0)
3245
3246 #if !INCLUDE_ALL_GCS
3247 static void force_serial_gc() {
3248 FLAG_SET_DEFAULT(UseSerialGC, true);
3249 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3250 UNSUPPORTED_GC_OPTION(UseG1GC);
3251 UNSUPPORTED_GC_OPTION(UseParallelGC);
3252 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3253 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3254 UNSUPPORTED_GC_OPTION(UseParNewGC);
3255 }
3256 #endif // INCLUDE_ALL_GCS
3257
3258 // Parse entry point called from JNI_CreateJavaVM
3259
3260 jint Arguments::parse(const JavaVMInitArgs* args) {
3261
3262 // Sharing support
3263 // Construct the path to the archive
3264 char jvm_path[JVM_MAXPATHLEN];
3265 os::jvm_path(jvm_path, sizeof(jvm_path));
3266 char *end = strrchr(jvm_path, *os::file_separator());
3267 if (end != NULL) *end = '\0';
3268 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3269 strlen(os::file_separator()) + 20, mtInternal);
3270 if (shared_archive_path == NULL) return JNI_ENOMEM;
3271 strcpy(shared_archive_path, jvm_path);
3272 strcat(shared_archive_path, os::file_separator());
3273 strcat(shared_archive_path, "classes");
3274 strcat(shared_archive_path, ".jsa");
3275 SharedArchivePath = shared_archive_path;
3276
3277 // Remaining part of option string
3278 const char* tail;
3279
3280 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3281 const char* hotspotrc = ".hotspotrc";
3282 bool settings_file_specified = false;
3283 bool needs_hotspotrc_warning = false;
3284
3285 const char* flags_file;
3286 int index;
3287 for (index = 0; index < args->nOptions; index++) {
3288 const JavaVMOption *option = args->options + index;
3289 if (match_option(option, "-XX:Flags=", &tail)) {
3290 flags_file = tail;
3291 settings_file_specified = true;
3292 }
3293 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3294 PrintVMOptions = true;
3295 }
3296 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3297 PrintVMOptions = false;
3298 }
3299 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3300 IgnoreUnrecognizedVMOptions = true;
3301 }
3302 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3303 IgnoreUnrecognizedVMOptions = false;
3304 }
3305 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3306 CommandLineFlags::printFlags(tty, false);
3307 vm_exit(0);
3308 }
3309 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3310 #if INCLUDE_NMT
3311 MemTracker::init_tracking_options(tail);
3312 #else
3313 jio_fprintf(defaultStream::error_stream(),
3314 "Native Memory Tracking is not supported in this VM\n");
3315 return JNI_ERR;
3316 #endif
3317 }
3318
3319
3320 #ifndef PRODUCT
3321 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3322 CommandLineFlags::printFlags(tty, true);
3323 vm_exit(0);
3324 }
3325 #endif
3326 }
3327
3328 if (IgnoreUnrecognizedVMOptions) {
3329 // uncast const to modify the flag args->ignoreUnrecognized
3330 *(jboolean*)(&args->ignoreUnrecognized) = true;
3331 }
3332
3333 // Parse specified settings file
3334 if (settings_file_specified) {
3335 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3336 return JNI_EINVAL;
3337 }
3338 } else {
3339 #ifdef ASSERT
3340 // Parse default .hotspotrc settings file
3341 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3342 return JNI_EINVAL;
3343 }
3344 #else
3345 struct stat buf;
3346 if (os::stat(hotspotrc, &buf) == 0) {
3347 needs_hotspotrc_warning = true;
3348 }
3349 #endif
3350 }
3351
3352 if (PrintVMOptions) {
3353 for (index = 0; index < args->nOptions; index++) {
3354 const JavaVMOption *option = args->options + index;
3355 if (match_option(option, "-XX:", &tail)) {
3356 logOption(tail);
3357 }
3358 }
3359 }
3360
3361 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3362 jint result = parse_vm_init_args(args);
3363 if (result != JNI_OK) {
3364 return result;
3365 }
3366
3367 // Delay warning until here so that we've had a chance to process
3368 // the -XX:-PrintWarnings flag
3369 if (needs_hotspotrc_warning) {
3370 warning("%s file is present but has been ignored. "
3371 "Run with -XX:Flags=%s to load the file.",
3372 hotspotrc, hotspotrc);
3373 }
3374
3375 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3376 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3377 #endif
3378
3379 #if INCLUDE_ALL_GCS
3380 #if (defined JAVASE_EMBEDDED || defined ARM)
3381 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3382 #endif
3383 #endif
3384
3385 #ifndef PRODUCT
3386 if (TraceBytecodesAt != 0) {
3387 TraceBytecodes = true;
3388 }
3389 if (CountCompiledCalls) {
3390 if (UseCounterDecay) {
3391 warning("UseCounterDecay disabled because CountCalls is set");
3392 UseCounterDecay = false;
3393 }
3394 }
3395 #endif // PRODUCT
3396
3397 // JSR 292 is not supported before 1.7
3398 if (!JDK_Version::is_gte_jdk17x_version()) {
3399 if (EnableInvokeDynamic) {
3400 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3401 warning("JSR 292 is not supported before 1.7. Disabling support.");
3402 }
3403 EnableInvokeDynamic = false;
3404 }
3405 }
3406
3407 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3408 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3409 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3410 }
3411 ScavengeRootsInCode = 1;
3412 }
3413
3414 if (PrintGCDetails) {
3415 // Turn on -verbose:gc options as well
3416 PrintGC = true;
3417 }
3418
3419 if (!JDK_Version::is_gte_jdk18x_version()) {
3420 // To avoid changing the log format for 7 updates this flag is only
3421 // true by default in JDK8 and above.
3422 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3423 FLAG_SET_DEFAULT(PrintGCCause, false);
3424 }
3425 }
3426
3427 // Set object alignment values.
3428 set_object_alignment();
3429
3430 #if !INCLUDE_ALL_GCS
3431 force_serial_gc();
3432 #endif // INCLUDE_ALL_GCS
3433 #if !INCLUDE_CDS
3434 if (DumpSharedSpaces || RequireSharedSpaces) {
3435 jio_fprintf(defaultStream::error_stream(),
3436 "Shared spaces are not supported in this VM\n");
3437 return JNI_ERR;
3438 }
3439 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3440 warning("Shared spaces are not supported in this VM");
3441 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3442 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3443 }
3444 no_shared_spaces();
3445 #endif // INCLUDE_CDS
3446
3447 // Set flags based on ergonomics.
3448 set_ergonomics_flags();
3449
3450 set_shared_spaces_flags();
3451
3452 // Check the GC selections again.
3453 if (!check_gc_consistency()) {
3454 return JNI_EINVAL;
3455 }
3456
3457 if (TieredCompilation) {
3458 set_tiered_flags();
3459 } else {
3460 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3461 if (CompilationPolicyChoice >= 2) {
3462 vm_exit_during_initialization(
3463 "Incompatible compilation policy selected", NULL);
3464 }
3465 }
3466
3467 // Set heap size based on available physical memory
3468 set_heap_size();
3469
3470 #if INCLUDE_ALL_GCS
3471 // Set per-collector flags
3472 if (UseParallelGC || UseParallelOldGC) {
3473 set_parallel_gc_flags();
3474 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3475 set_cms_and_parnew_gc_flags();
3476 } else if (UseParNewGC) { // skipped if CMS is set above
3477 set_parnew_gc_flags();
3478 } else if (UseG1GC) {
3479 set_g1_gc_flags();
3480 }
3481 check_deprecated_gcs();
3482 check_deprecated_gc_flags();
3483 if (AssumeMP && !UseSerialGC) {
3484 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3485 warning("If the number of processors is expected to increase from one, then"
3486 " you should configure the number of parallel GC threads appropriately"
3487 " using -XX:ParallelGCThreads=N");
3488 }
3489 }
3490 #else // INCLUDE_ALL_GCS
3491 assert(verify_serial_gc_flags(), "SerialGC unset");
3492 #endif // INCLUDE_ALL_GCS
3493
3494 // Set bytecode rewriting flags
3495 set_bytecode_flags();
3496
3497 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3498 set_aggressive_opts_flags();
3499
3500 // Turn off biased locking for locking debug mode flags,
3501 // which are subtlely different from each other but neither works with
3502 // biased locking.
3503 if (UseHeavyMonitors
3504 #ifdef COMPILER1
3505 || !UseFastLocking
3506 #endif // COMPILER1
3507 ) {
3508 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3509 // flag set to true on command line; warn the user that they
3510 // can't enable biased locking here
3511 warning("Biased Locking is not supported with locking debug flags"
3512 "; ignoring UseBiasedLocking flag." );
3513 }
3514 UseBiasedLocking = false;
3515 }
3516
3517 #ifdef CC_INTERP
3518 // Clear flags not supported by the C++ interpreter
3519 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3520 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3521 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3522 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3523 #endif // CC_INTERP
3524
3525 #ifdef COMPILER2
3526 if (!UseBiasedLocking || EmitSync != 0) {
3527 UseOptoBiasInlining = false;
3528 }
3529 if (!EliminateLocks) {
3530 EliminateNestedLocks = false;
3531 }
3532 if (!Inline) {
3533 IncrementalInline = false;
3534 }
3535 #ifndef PRODUCT
3536 if (!IncrementalInline) {
3537 AlwaysIncrementalInline = false;
3538 }
3539 #endif
3540 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3541 // incremental inlining: bump MaxNodeLimit
3542 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3543 }
3544 #endif
3545
3546 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3547 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3548 DebugNonSafepoints = true;
3549 }
3550
3551 #ifndef PRODUCT
3552 if (CompileTheWorld) {
3553 // Force NmethodSweeper to sweep whole CodeCache each time.
3554 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3555 NmethodSweepFraction = 1;
3556 }
3557 }
3558 #endif
3559
3560 if (PrintCommandLineFlags) {
3561 CommandLineFlags::printSetFlags(tty);
3562 }
3563
3564 // Apply CPU specific policy for the BiasedLocking
3565 if (UseBiasedLocking) {
3566 if (!VM_Version::use_biased_locking() &&
3567 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3568 UseBiasedLocking = false;
3569 }
3570 }
3571
3572 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3573 // but only if not already set on the commandline
3574 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3575 bool set = false;
3576 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3577 if (!set) {
3578 FLAG_SET_DEFAULT(PauseAtExit, true);
3579 }
3580 }
3581
3582 return JNI_OK;
3583 }
3584
3585 jint Arguments::adjust_after_os() {
3586 #if INCLUDE_ALL_GCS
3587 if (UseParallelGC || UseParallelOldGC) {
3588 if (UseNUMA) {
3589 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3590 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3591 }
3592 // For those collectors or operating systems (eg, Windows) that do
3593 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3594 UseNUMAInterleaving = true;
3595 }
3596 }
3597 #endif // INCLUDE_ALL_GCS
3598 return JNI_OK;
3599 }
3600
3601 int Arguments::PropertyList_count(SystemProperty* pl) {
3602 int count = 0;
3603 while(pl != NULL) {
3604 count++;
3605 pl = pl->next();
3606 }
3607 return count;
3608 }
3609
3610 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3611 assert(key != NULL, "just checking");
3612 SystemProperty* prop;
3613 for (prop = pl; prop != NULL; prop = prop->next()) {
3614 if (strcmp(key, prop->key()) == 0) return prop->value();
3615 }
3616 return NULL;
3617 }
3618
3619 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3620 int count = 0;
3621 const char* ret_val = NULL;
3622
3623 while(pl != NULL) {
3624 if(count >= index) {
3625 ret_val = pl->key();
3626 break;
3627 }
3628 count++;
3629 pl = pl->next();
3630 }
3631
3632 return ret_val;
3633 }
3634
3635 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3636 int count = 0;
3637 char* ret_val = NULL;
3638
3639 while(pl != NULL) {
3640 if(count >= index) {
3641 ret_val = pl->value();
3642 break;
3643 }
3644 count++;
3645 pl = pl->next();
3646 }
3647
3648 return ret_val;
3649 }
3650
3651 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3652 SystemProperty* p = *plist;
3653 if (p == NULL) {
3654 *plist = new_p;
3655 } else {
3656 while (p->next() != NULL) {
3657 p = p->next();
3658 }
3659 p->set_next(new_p);
3660 }
3661 }
3662
3663 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3664 if (plist == NULL)
3665 return;
3666
3667 SystemProperty* new_p = new SystemProperty(k, v, true);
3668 PropertyList_add(plist, new_p);
3669 }
3670
3671 // This add maintains unique property key in the list.
3672 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3673 if (plist == NULL)
3674 return;
3675
3676 // If property key exist then update with new value.
3677 SystemProperty* prop;
3678 for (prop = *plist; prop != NULL; prop = prop->next()) {
3679 if (strcmp(k, prop->key()) == 0) {
3680 if (append) {
3681 prop->append_value(v);
3682 } else {
3683 prop->set_value(v);
3684 }
3685 return;
3686 }
3687 }
3688
3689 PropertyList_add(plist, k, v);
3690 }
3691
3692 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3693 // Returns true if all of the source pointed by src has been copied over to
3694 // the destination buffer pointed by buf. Otherwise, returns false.
3695 // Notes:
3696 // 1. If the length (buflen) of the destination buffer excluding the
3697 // NULL terminator character is not long enough for holding the expanded
3698 // pid characters, it also returns false instead of returning the partially
3699 // expanded one.
3700 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3701 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3702 char* buf, size_t buflen) {
3703 const char* p = src;
3704 char* b = buf;
3705 const char* src_end = &src[srclen];
3706 char* buf_end = &buf[buflen - 1];
3707
3708 while (p < src_end && b < buf_end) {
3709 if (*p == '%') {
3710 switch (*(++p)) {
3711 case '%': // "%%" ==> "%"
3712 *b++ = *p++;
3713 break;
3714 case 'p': { // "%p" ==> current process id
3715 // buf_end points to the character before the last character so
3716 // that we could write '\0' to the end of the buffer.
3717 size_t buf_sz = buf_end - b + 1;
3718 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3719
3720 // if jio_snprintf fails or the buffer is not long enough to hold
3721 // the expanded pid, returns false.
3722 if (ret < 0 || ret >= (int)buf_sz) {
3723 return false;
3724 } else {
3725 b += ret;
3726 assert(*b == '\0', "fail in copy_expand_pid");
3727 if (p == src_end && b == buf_end + 1) {
3728 // reach the end of the buffer.
3729 return true;
3730 }
3731 }
3732 p++;
3733 break;
3734 }
3735 default :
3736 *b++ = '%';
3737 }
3738 } else {
3739 *b++ = *p++;
3740 }
3741 }
3742 *b = '\0';
3743 return (p == src_end); // return false if not all of the source was copied
3744 }