1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "compiler/compilerOracle.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/cardTableRS.hpp"
30 #include "memory/referenceProcessor.hpp"
31 #include "memory/universe.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/jvmtiExport.hpp"
34 #include "runtime/arguments.hpp"
35 #include "runtime/globals_extension.hpp"
36 #include "runtime/java.hpp"
37 #include "services/management.hpp"
38 #include "services/memTracker.hpp"
39 #include "utilities/defaultStream.hpp"
40 #include "utilities/taskqueue.hpp"
41 #ifdef TARGET_OS_FAMILY_linux
42 # include "os_linux.inline.hpp"
43 #endif
44 #ifdef TARGET_OS_FAMILY_solaris
45 # include "os_solaris.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_windows
48 # include "os_windows.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_bsd
51 # include "os_bsd.inline.hpp"
52 #endif
53 #ifndef SERIALGC
54 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
55 #endif
56
57 // Note: This is a special bug reporting site for the JVM
58 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
59 #define DEFAULT_JAVA_LAUNCHER "generic"
60
61 char** Arguments::_jvm_flags_array = NULL;
62 int Arguments::_num_jvm_flags = 0;
63 char** Arguments::_jvm_args_array = NULL;
64 int Arguments::_num_jvm_args = 0;
65 char* Arguments::_java_command = NULL;
66 SystemProperty* Arguments::_system_properties = NULL;
67 const char* Arguments::_gc_log_filename = NULL;
68 bool Arguments::_has_profile = false;
69 bool Arguments::_has_alloc_profile = false;
70 uintx Arguments::_min_heap_size = 0;
71 Arguments::Mode Arguments::_mode = _mixed;
72 bool Arguments::_java_compiler = false;
73 bool Arguments::_xdebug_mode = false;
74 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
75 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
76 int Arguments::_sun_java_launcher_pid = -1;
77 bool Arguments::_created_by_gamma_launcher = false;
78
79 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
80 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
81 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
82 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
83 bool Arguments::_ClipInlining = ClipInlining;
84
85 char* Arguments::SharedArchivePath = NULL;
86
87 AgentLibraryList Arguments::_libraryList;
88 AgentLibraryList Arguments::_agentList;
89
90 abort_hook_t Arguments::_abort_hook = NULL;
91 exit_hook_t Arguments::_exit_hook = NULL;
92 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
93
94
95 SystemProperty *Arguments::_java_ext_dirs = NULL;
96 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
97 SystemProperty *Arguments::_sun_boot_library_path = NULL;
98 SystemProperty *Arguments::_java_library_path = NULL;
99 SystemProperty *Arguments::_java_home = NULL;
100 SystemProperty *Arguments::_java_class_path = NULL;
101 SystemProperty *Arguments::_sun_boot_class_path = NULL;
102
103 char* Arguments::_meta_index_path = NULL;
104 char* Arguments::_meta_index_dir = NULL;
105
106 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
107
108 static bool match_option(const JavaVMOption *option, const char* name,
109 const char** tail) {
110 int len = (int)strlen(name);
111 if (strncmp(option->optionString, name, len) == 0) {
112 *tail = option->optionString + len;
113 return true;
114 } else {
115 return false;
116 }
117 }
118
119 static void logOption(const char* opt) {
120 if (PrintVMOptions) {
121 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
122 }
123 }
124
125 // Process java launcher properties.
126 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
127 // See if sun.java.launcher or sun.java.launcher.pid is defined.
128 // Must do this before setting up other system properties,
129 // as some of them may depend on launcher type.
130 for (int index = 0; index < args->nOptions; index++) {
131 const JavaVMOption* option = args->options + index;
132 const char* tail;
133
134 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
135 process_java_launcher_argument(tail, option->extraInfo);
136 continue;
137 }
138 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
139 _sun_java_launcher_pid = atoi(tail);
140 continue;
141 }
142 }
143 }
144
145 // Initialize system properties key and value.
146 void Arguments::init_system_properties() {
147
148 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
149 "Java Virtual Machine Specification", false));
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
153
154 // following are JVMTI agent writeable properties.
155 // Properties values are set to NULL and they are
156 // os specific they are initialized in os::init_system_properties_values().
157 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
158 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
159 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
160 _java_library_path = new SystemProperty("java.library.path", NULL, true);
161 _java_home = new SystemProperty("java.home", NULL, true);
162 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
163
164 _java_class_path = new SystemProperty("java.class.path", "", true);
165
166 // Add to System Property list.
167 PropertyList_add(&_system_properties, _java_ext_dirs);
168 PropertyList_add(&_system_properties, _java_endorsed_dirs);
169 PropertyList_add(&_system_properties, _sun_boot_library_path);
170 PropertyList_add(&_system_properties, _java_library_path);
171 PropertyList_add(&_system_properties, _java_home);
172 PropertyList_add(&_system_properties, _java_class_path);
173 PropertyList_add(&_system_properties, _sun_boot_class_path);
174
175 // Set OS specific system properties values
176 os::init_system_properties_values();
177 }
178
179
180 // Update/Initialize System properties after JDK version number is known
181 void Arguments::init_version_specific_system_properties() {
182 enum { bufsz = 16 };
183 char buffer[bufsz];
184 const char* spec_vendor = "Sun Microsystems Inc.";
185 uint32_t spec_version = 0;
186
187 if (JDK_Version::is_gte_jdk17x_version()) {
188 spec_vendor = "Oracle Corporation";
189 spec_version = JDK_Version::current().major_version();
190 }
191 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
192
193 PropertyList_add(&_system_properties,
194 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
195 PropertyList_add(&_system_properties,
196 new SystemProperty("java.vm.specification.version", buffer, false));
197 PropertyList_add(&_system_properties,
198 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
199 }
200
201 /**
202 * Provide a slightly more user-friendly way of eliminating -XX flags.
203 * When a flag is eliminated, it can be added to this list in order to
204 * continue accepting this flag on the command-line, while issuing a warning
205 * and ignoring the value. Once the JDK version reaches the 'accept_until'
206 * limit, we flatly refuse to admit the existence of the flag. This allows
207 * a flag to die correctly over JDK releases using HSX.
208 */
209 typedef struct {
210 const char* name;
211 JDK_Version obsoleted_in; // when the flag went away
212 JDK_Version accept_until; // which version to start denying the existence
213 } ObsoleteFlag;
214
215 static ObsoleteFlag obsolete_jvm_flags[] = {
216 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
217 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
230 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
231 { "DefaultInitialRAMFraction",
232 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "UseDepthFirstScavengeOrder",
234 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
235 { "HandlePromotionFailure",
236 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
237 { "MaxLiveObjectEvacuationRatio",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
240 { "UseParallelOldGCCompacting",
241 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
242 { "UseParallelDensePrefixUpdate",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelOldGCDensePrefix",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
247 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "AlwaysInflate", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
249 { "AnonymousClasses", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
250 { "CMSOldPLABReactivityCeiling",
251 JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
252 { "EventLogLength", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
253 { "GCOverheadReporting", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
254 { "GCOverheadReportingPeriodMS",
255 JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
256 { "HPILibPath", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
257 { "PreSpinYield", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
258 { "PreBlockSpin", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
259 { "PostSpinYield", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
260 { "PreserveMarkStackSize",
261 JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
262 { "ReadSpinIterations", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
263 { "StressTieredRuntime", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
264 { "Tier1Inline", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
265 { "Tier1FreqInlineSize", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
266 { "Tier1MaxInlineSize", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
267 { "Tier1LoopOptsCount", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
268 { "UseSpinning", JDK_Version::jdk_update(7,40), JDK_Version::jdk(8) },
269 #ifdef PRODUCT
270 { "DesiredMethodLimit",
271 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
272 #endif // PRODUCT
273 { NULL, JDK_Version(0), JDK_Version(0) }
274 };
275
276 // Returns true if the flag is obsolete and fits into the range specified
277 // for being ignored. In the case that the flag is ignored, the 'version'
278 // value is filled in with the version number when the flag became
279 // obsolete so that that value can be displayed to the user.
280 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
281 int i = 0;
282 assert(version != NULL, "Must provide a version buffer");
283 while (obsolete_jvm_flags[i].name != NULL) {
284 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
285 // <flag>=xxx form
286 // [-|+]<flag> form
287 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
288 ((s[0] == '+' || s[0] == '-') &&
289 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
290 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
291 *version = flag_status.obsoleted_in;
292 return true;
293 }
294 }
295 i++;
296 }
297 return false;
298 }
299
300 // Constructs the system class path (aka boot class path) from the following
301 // components, in order:
302 //
303 // prefix // from -Xbootclasspath/p:...
304 // endorsed // the expansion of -Djava.endorsed.dirs=...
305 // base // from os::get_system_properties() or -Xbootclasspath=
306 // suffix // from -Xbootclasspath/a:...
307 //
308 // java.endorsed.dirs is a list of directories; any jar or zip files in the
309 // directories are added to the sysclasspath just before the base.
310 //
311 // This could be AllStatic, but it isn't needed after argument processing is
312 // complete.
313 class SysClassPath: public StackObj {
314 public:
315 SysClassPath(const char* base);
316 ~SysClassPath();
317
318 inline void set_base(const char* base);
319 inline void add_prefix(const char* prefix);
320 inline void add_suffix_to_prefix(const char* suffix);
321 inline void add_suffix(const char* suffix);
322 inline void reset_path(const char* base);
323
324 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
325 // property. Must be called after all command-line arguments have been
326 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
327 // combined_path().
328 void expand_endorsed();
329
330 inline const char* get_base() const { return _items[_scp_base]; }
331 inline const char* get_prefix() const { return _items[_scp_prefix]; }
332 inline const char* get_suffix() const { return _items[_scp_suffix]; }
333 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
334
335 // Combine all the components into a single c-heap-allocated string; caller
336 // must free the string if/when no longer needed.
337 char* combined_path();
338
339 private:
340 // Utility routines.
341 static char* add_to_path(const char* path, const char* str, bool prepend);
342 static char* add_jars_to_path(char* path, const char* directory);
343
344 inline void reset_item_at(int index);
345
346 // Array indices for the items that make up the sysclasspath. All except the
347 // base are allocated in the C heap and freed by this class.
348 enum {
349 _scp_prefix, // from -Xbootclasspath/p:...
350 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
351 _scp_base, // the default sysclasspath
352 _scp_suffix, // from -Xbootclasspath/a:...
353 _scp_nitems // the number of items, must be last.
354 };
355
356 const char* _items[_scp_nitems];
357 DEBUG_ONLY(bool _expansion_done;)
358 };
359
360 SysClassPath::SysClassPath(const char* base) {
361 memset(_items, 0, sizeof(_items));
362 _items[_scp_base] = base;
363 DEBUG_ONLY(_expansion_done = false;)
364 }
365
366 SysClassPath::~SysClassPath() {
367 // Free everything except the base.
368 for (int i = 0; i < _scp_nitems; ++i) {
369 if (i != _scp_base) reset_item_at(i);
370 }
371 DEBUG_ONLY(_expansion_done = false;)
372 }
373
374 inline void SysClassPath::set_base(const char* base) {
375 _items[_scp_base] = base;
376 }
377
378 inline void SysClassPath::add_prefix(const char* prefix) {
379 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
380 }
381
382 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
383 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
384 }
385
386 inline void SysClassPath::add_suffix(const char* suffix) {
387 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
388 }
389
390 inline void SysClassPath::reset_item_at(int index) {
391 assert(index < _scp_nitems && index != _scp_base, "just checking");
392 if (_items[index] != NULL) {
393 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
394 _items[index] = NULL;
395 }
396 }
397
398 inline void SysClassPath::reset_path(const char* base) {
399 // Clear the prefix and suffix.
400 reset_item_at(_scp_prefix);
401 reset_item_at(_scp_suffix);
402 set_base(base);
403 }
404
405 //------------------------------------------------------------------------------
406
407 void SysClassPath::expand_endorsed() {
408 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
409
410 const char* path = Arguments::get_property("java.endorsed.dirs");
411 if (path == NULL) {
412 path = Arguments::get_endorsed_dir();
413 assert(path != NULL, "no default for java.endorsed.dirs");
414 }
415
416 char* expanded_path = NULL;
417 const char separator = *os::path_separator();
418 const char* const end = path + strlen(path);
419 while (path < end) {
420 const char* tmp_end = strchr(path, separator);
421 if (tmp_end == NULL) {
422 expanded_path = add_jars_to_path(expanded_path, path);
423 path = end;
424 } else {
425 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
426 memcpy(dirpath, path, tmp_end - path);
427 dirpath[tmp_end - path] = '\0';
428 expanded_path = add_jars_to_path(expanded_path, dirpath);
429 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
430 path = tmp_end + 1;
431 }
432 }
433 _items[_scp_endorsed] = expanded_path;
434 DEBUG_ONLY(_expansion_done = true;)
435 }
436
437 // Combine the bootclasspath elements, some of which may be null, into a single
438 // c-heap-allocated string.
439 char* SysClassPath::combined_path() {
440 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
441 assert(_expansion_done, "must call expand_endorsed() first.");
442
443 size_t lengths[_scp_nitems];
444 size_t total_len = 0;
445
446 const char separator = *os::path_separator();
447
448 // Get the lengths.
449 int i;
450 for (i = 0; i < _scp_nitems; ++i) {
451 if (_items[i] != NULL) {
452 lengths[i] = strlen(_items[i]);
453 // Include space for the separator char (or a NULL for the last item).
454 total_len += lengths[i] + 1;
455 }
456 }
457 assert(total_len > 0, "empty sysclasspath not allowed");
458
459 // Copy the _items to a single string.
460 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
461 char* cp_tmp = cp;
462 for (i = 0; i < _scp_nitems; ++i) {
463 if (_items[i] != NULL) {
464 memcpy(cp_tmp, _items[i], lengths[i]);
465 cp_tmp += lengths[i];
466 *cp_tmp++ = separator;
467 }
468 }
469 *--cp_tmp = '\0'; // Replace the extra separator.
470 return cp;
471 }
472
473 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
474 char*
475 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
476 char *cp;
477
478 assert(str != NULL, "just checking");
479 if (path == NULL) {
480 size_t len = strlen(str) + 1;
481 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
482 memcpy(cp, str, len); // copy the trailing null
483 } else {
484 const char separator = *os::path_separator();
485 size_t old_len = strlen(path);
486 size_t str_len = strlen(str);
487 size_t len = old_len + str_len + 2;
488
489 if (prepend) {
490 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
491 char* cp_tmp = cp;
492 memcpy(cp_tmp, str, str_len);
493 cp_tmp += str_len;
494 *cp_tmp = separator;
495 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
496 FREE_C_HEAP_ARRAY(char, path, mtInternal);
497 } else {
498 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
499 char* cp_tmp = cp + old_len;
500 *cp_tmp = separator;
501 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
502 }
503 }
504 return cp;
505 }
506
507 // Scan the directory and append any jar or zip files found to path.
508 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
509 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
510 DIR* dir = os::opendir(directory);
511 if (dir == NULL) return path;
512
513 char dir_sep[2] = { '\0', '\0' };
514 size_t directory_len = strlen(directory);
515 const char fileSep = *os::file_separator();
516 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
517
518 /* Scan the directory for jars/zips, appending them to path. */
519 struct dirent *entry;
520 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
521 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
522 const char* name = entry->d_name;
523 const char* ext = name + strlen(name) - 4;
524 bool isJarOrZip = ext > name &&
525 (os::file_name_strcmp(ext, ".jar") == 0 ||
526 os::file_name_strcmp(ext, ".zip") == 0);
527 if (isJarOrZip) {
528 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
529 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
530 path = add_to_path(path, jarpath, false);
531 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
532 }
533 }
534 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
535 os::closedir(dir);
536 return path;
537 }
538
539 // Parses a memory size specification string.
540 static bool atomull(const char *s, julong* result) {
541 julong n = 0;
542 int args_read = sscanf(s, os::julong_format_specifier(), &n);
543 if (args_read != 1) {
544 return false;
545 }
546 while (*s != '\0' && isdigit(*s)) {
547 s++;
548 }
549 // 4705540: illegal if more characters are found after the first non-digit
550 if (strlen(s) > 1) {
551 return false;
552 }
553 switch (*s) {
554 case 'T': case 't':
555 *result = n * G * K;
556 // Check for overflow.
557 if (*result/((julong)G * K) != n) return false;
558 return true;
559 case 'G': case 'g':
560 *result = n * G;
561 if (*result/G != n) return false;
562 return true;
563 case 'M': case 'm':
564 *result = n * M;
565 if (*result/M != n) return false;
566 return true;
567 case 'K': case 'k':
568 *result = n * K;
569 if (*result/K != n) return false;
570 return true;
571 case '\0':
572 *result = n;
573 return true;
574 default:
575 return false;
576 }
577 }
578
579 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
580 if (size < min_size) return arg_too_small;
581 // Check that size will fit in a size_t (only relevant on 32-bit)
582 if (size > max_uintx) return arg_too_big;
583 return arg_in_range;
584 }
585
586 // Describe an argument out of range error
587 void Arguments::describe_range_error(ArgsRange errcode) {
588 switch(errcode) {
589 case arg_too_big:
590 jio_fprintf(defaultStream::error_stream(),
591 "The specified size exceeds the maximum "
592 "representable size.\n");
593 break;
594 case arg_too_small:
595 case arg_unreadable:
596 case arg_in_range:
597 // do nothing for now
598 break;
599 default:
600 ShouldNotReachHere();
601 }
602 }
603
604 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
605 return CommandLineFlags::boolAtPut(name, &value, origin);
606 }
607
608 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
609 double v;
610 if (sscanf(value, "%lf", &v) != 1) {
611 return false;
612 }
613
614 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
615 return true;
616 }
617 return false;
618 }
619
620 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
621 julong v;
622 intx intx_v;
623 bool is_neg = false;
624 // Check the sign first since atomull() parses only unsigned values.
625 if (*value == '-') {
626 if (!CommandLineFlags::intxAt(name, &intx_v)) {
627 return false;
628 }
629 value++;
630 is_neg = true;
631 }
632 if (!atomull(value, &v)) {
633 return false;
634 }
635 intx_v = (intx) v;
636 if (is_neg) {
637 intx_v = -intx_v;
638 }
639 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
640 return true;
641 }
642 uintx uintx_v = (uintx) v;
643 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
644 return true;
645 }
646 uint64_t uint64_t_v = (uint64_t) v;
647 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
648 return true;
649 }
650 return false;
651 }
652
653 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
654 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
655 // Contract: CommandLineFlags always returns a pointer that needs freeing.
656 FREE_C_HEAP_ARRAY(char, value, mtInternal);
657 return true;
658 }
659
660 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
661 const char* old_value = "";
662 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
663 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
664 size_t new_len = strlen(new_value);
665 const char* value;
666 char* free_this_too = NULL;
667 if (old_len == 0) {
668 value = new_value;
669 } else if (new_len == 0) {
670 value = old_value;
671 } else {
672 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
673 // each new setting adds another LINE to the switch:
674 sprintf(buf, "%s\n%s", old_value, new_value);
675 value = buf;
676 free_this_too = buf;
677 }
678 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
679 // CommandLineFlags always returns a pointer that needs freeing.
680 FREE_C_HEAP_ARRAY(char, value, mtInternal);
681 if (free_this_too != NULL) {
682 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
683 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
684 }
685 return true;
686 }
687
688 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
689
690 // range of acceptable characters spelled out for portability reasons
691 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
692 #define BUFLEN 255
693 char name[BUFLEN+1];
694 char dummy;
695
696 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
697 return set_bool_flag(name, false, origin);
698 }
699 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
700 return set_bool_flag(name, true, origin);
701 }
702
703 char punct;
704 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
705 const char* value = strchr(arg, '=') + 1;
706 Flag* flag = Flag::find_flag(name, strlen(name));
707 if (flag != NULL && flag->is_ccstr()) {
708 if (flag->ccstr_accumulates()) {
709 return append_to_string_flag(name, value, origin);
710 } else {
711 if (value[0] == '\0') {
712 value = NULL;
713 }
714 return set_string_flag(name, value, origin);
715 }
716 }
717 }
718
719 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
720 const char* value = strchr(arg, '=') + 1;
721 // -XX:Foo:=xxx will reset the string flag to the given value.
722 if (value[0] == '\0') {
723 value = NULL;
724 }
725 return set_string_flag(name, value, origin);
726 }
727
728 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
729 #define SIGNED_NUMBER_RANGE "[-0123456789]"
730 #define NUMBER_RANGE "[0123456789]"
731 char value[BUFLEN + 1];
732 char value2[BUFLEN + 1];
733 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
734 // Looks like a floating-point number -- try again with more lenient format string
735 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
736 return set_fp_numeric_flag(name, value, origin);
737 }
738 }
739
740 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
741 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
742 return set_numeric_flag(name, value, origin);
743 }
744
745 return false;
746 }
747
748 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
749 assert(bldarray != NULL, "illegal argument");
750
751 if (arg == NULL) {
752 return;
753 }
754
755 int index = *count;
756
757 // expand the array and add arg to the last element
758 (*count)++;
759 if (*bldarray == NULL) {
760 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
761 } else {
762 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
763 }
764 (*bldarray)[index] = strdup(arg);
765 }
766
767 void Arguments::build_jvm_args(const char* arg) {
768 add_string(&_jvm_args_array, &_num_jvm_args, arg);
769 }
770
771 void Arguments::build_jvm_flags(const char* arg) {
772 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
773 }
774
775 // utility function to return a string that concatenates all
776 // strings in a given char** array
777 const char* Arguments::build_resource_string(char** args, int count) {
778 if (args == NULL || count == 0) {
779 return NULL;
780 }
781 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
782 for (int i = 1; i < count; i++) {
783 length += strlen(args[i]) + 1; // add 1 for a space
784 }
785 char* s = NEW_RESOURCE_ARRAY(char, length);
786 strcpy(s, args[0]);
787 for (int j = 1; j < count; j++) {
788 strcat(s, " ");
789 strcat(s, args[j]);
790 }
791 return (const char*) s;
792 }
793
794 void Arguments::print_on(outputStream* st) {
795 st->print_cr("VM Arguments:");
796 if (num_jvm_flags() > 0) {
797 st->print("jvm_flags: "); print_jvm_flags_on(st);
798 }
799 if (num_jvm_args() > 0) {
800 st->print("jvm_args: "); print_jvm_args_on(st);
801 }
802 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
803 st->print_cr("Launcher Type: %s", _sun_java_launcher);
804 }
805
806 void Arguments::print_jvm_flags_on(outputStream* st) {
807 if (_num_jvm_flags > 0) {
808 for (int i=0; i < _num_jvm_flags; i++) {
809 st->print("%s ", _jvm_flags_array[i]);
810 }
811 st->print_cr("");
812 }
813 }
814
815 void Arguments::print_jvm_args_on(outputStream* st) {
816 if (_num_jvm_args > 0) {
817 for (int i=0; i < _num_jvm_args; i++) {
818 st->print("%s ", _jvm_args_array[i]);
819 }
820 st->print_cr("");
821 }
822 }
823
824 bool Arguments::process_argument(const char* arg,
825 jboolean ignore_unrecognized, FlagValueOrigin origin) {
826
827 JDK_Version since = JDK_Version();
828
829 if (parse_argument(arg, origin) || ignore_unrecognized) {
830 return true;
831 }
832
833 bool has_plus_minus = (*arg == '+' || *arg == '-');
834 const char* const argname = has_plus_minus ? arg + 1 : arg;
835 if (is_newly_obsolete(arg, &since)) {
836 char version[256];
837 since.to_string(version, sizeof(version));
838 warning("ignoring option %s; support was removed in %s", argname, version);
839 return true;
840 }
841
842 // For locked flags, report a custom error message if available.
843 // Otherwise, report a standard VM option message.
844
845 size_t arg_len;
846 const char* equal_sign = strchr(argname, '=');
847 if (equal_sign == NULL) {
848 arg_len = strlen(argname);
849 } else {
850 arg_len = equal_sign - argname;
851 }
852
853 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true);
854 if (found_flag != NULL) {
855 char locked_message_buf[BUFLEN];
856 found_flag->get_locked_message(locked_message_buf, BUFLEN);
857 if (strlen(locked_message_buf) == 0) {
858 if (found_flag->is_bool() && !has_plus_minus) {
859 jio_fprintf(defaultStream::error_stream(),
860 "Missing +/- setting for VM option '%s'\n", argname);
861 } else if (!found_flag->is_bool() && has_plus_minus) {
862 jio_fprintf(defaultStream::error_stream(),
863 "Unexpected +/- setting in VM option '%s'\n", argname);
864 } else {
865 jio_fprintf(defaultStream::error_stream(),
866 "Improperly specified VM option '%s'\n", argname);
867 }
868 } else {
869 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
870 }
871 } else {
872 jio_fprintf(defaultStream::error_stream(),
873 "Unrecognized VM option '%s'\n", argname);
874 }
875
876 // allow for commandline "commenting out" options like -XX:#+Verbose
877 return arg[0] == '#';
878 }
879
880 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
881 FILE* stream = fopen(file_name, "rb");
882 if (stream == NULL) {
883 if (should_exist) {
884 jio_fprintf(defaultStream::error_stream(),
885 "Could not open settings file %s\n", file_name);
886 return false;
887 } else {
888 return true;
889 }
890 }
891
892 char token[1024];
893 int pos = 0;
894
895 bool in_white_space = true;
896 bool in_comment = false;
897 bool in_quote = false;
898 char quote_c = 0;
899 bool result = true;
900
901 int c = getc(stream);
902 while(c != EOF && pos < (int)(sizeof(token)-1)) {
903 if (in_white_space) {
904 if (in_comment) {
905 if (c == '\n') in_comment = false;
906 } else {
907 if (c == '#') in_comment = true;
908 else if (!isspace(c)) {
909 in_white_space = false;
910 token[pos++] = c;
911 }
912 }
913 } else {
914 if (c == '\n' || (!in_quote && isspace(c))) {
915 // token ends at newline, or at unquoted whitespace
916 // this allows a way to include spaces in string-valued options
917 token[pos] = '\0';
918 logOption(token);
919 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
920 build_jvm_flags(token);
921 pos = 0;
922 in_white_space = true;
923 in_quote = false;
924 } else if (!in_quote && (c == '\'' || c == '"')) {
925 in_quote = true;
926 quote_c = c;
927 } else if (in_quote && (c == quote_c)) {
928 in_quote = false;
929 } else {
930 token[pos++] = c;
931 }
932 }
933 c = getc(stream);
934 }
935 if (pos > 0) {
936 token[pos] = '\0';
937 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
938 build_jvm_flags(token);
939 }
940 fclose(stream);
941 return result;
942 }
943
944 //=============================================================================================================
945 // Parsing of properties (-D)
946
947 const char* Arguments::get_property(const char* key) {
948 return PropertyList_get_value(system_properties(), key);
949 }
950
951 bool Arguments::add_property(const char* prop) {
952 const char* eq = strchr(prop, '=');
953 char* key;
954 // ns must be static--its address may be stored in a SystemProperty object.
955 const static char ns[1] = {0};
956 char* value = (char *)ns;
957
958 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
959 key = AllocateHeap(key_len + 1, mtInternal);
960 strncpy(key, prop, key_len);
961 key[key_len] = '\0';
962
963 if (eq != NULL) {
964 size_t value_len = strlen(prop) - key_len - 1;
965 value = AllocateHeap(value_len + 1, mtInternal);
966 strncpy(value, &prop[key_len + 1], value_len + 1);
967 }
968
969 if (strcmp(key, "java.compiler") == 0) {
970 process_java_compiler_argument(value);
971 FreeHeap(key);
972 if (eq != NULL) {
973 FreeHeap(value);
974 }
975 return true;
976 } else if (strcmp(key, "sun.java.command") == 0) {
977 _java_command = value;
978
979 // Record value in Arguments, but let it get passed to Java.
980 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
981 // launcher.pid property is private and is processed
982 // in process_sun_java_launcher_properties();
983 // the sun.java.launcher property is passed on to the java application
984 FreeHeap(key);
985 if (eq != NULL) {
986 FreeHeap(value);
987 }
988 return true;
989 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
990 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
991 // its value without going through the property list or making a Java call.
992 _java_vendor_url_bug = value;
993 } else if (strcmp(key, "sun.boot.library.path") == 0) {
994 PropertyList_unique_add(&_system_properties, key, value, true);
995 return true;
996 }
997 // Create new property and add at the end of the list
998 PropertyList_unique_add(&_system_properties, key, value);
999 return true;
1000 }
1001
1002 //===========================================================================================================
1003 // Setting int/mixed/comp mode flags
1004
1005 void Arguments::set_mode_flags(Mode mode) {
1006 // Set up default values for all flags.
1007 // If you add a flag to any of the branches below,
1008 // add a default value for it here.
1009 set_java_compiler(false);
1010 _mode = mode;
1011
1012 // Ensure Agent_OnLoad has the correct initial values.
1013 // This may not be the final mode; mode may change later in onload phase.
1014 PropertyList_unique_add(&_system_properties, "java.vm.info",
1015 (char*)VM_Version::vm_info_string(), false);
1016
1017 UseInterpreter = true;
1018 UseCompiler = true;
1019 UseLoopCounter = true;
1020
1021 #ifndef ZERO
1022 // Turn these off for mixed and comp. Leave them on for Zero.
1023 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1024 UseFastAccessorMethods = (mode == _int);
1025 }
1026 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1027 UseFastEmptyMethods = (mode == _int);
1028 }
1029 #endif
1030
1031 // Default values may be platform/compiler dependent -
1032 // use the saved values
1033 ClipInlining = Arguments::_ClipInlining;
1034 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1035 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1036 BackgroundCompilation = Arguments::_BackgroundCompilation;
1037
1038 // Change from defaults based on mode
1039 switch (mode) {
1040 default:
1041 ShouldNotReachHere();
1042 break;
1043 case _int:
1044 UseCompiler = false;
1045 UseLoopCounter = false;
1046 AlwaysCompileLoopMethods = false;
1047 UseOnStackReplacement = false;
1048 break;
1049 case _mixed:
1050 // same as default
1051 break;
1052 case _comp:
1053 UseInterpreter = false;
1054 BackgroundCompilation = false;
1055 ClipInlining = false;
1056 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1057 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1058 // compile a level 4 (C2) and then continue executing it.
1059 if (TieredCompilation) {
1060 Tier3InvokeNotifyFreqLog = 0;
1061 Tier4InvocationThreshold = 0;
1062 }
1063 break;
1064 }
1065 }
1066
1067 // Conflict: required to use shared spaces (-Xshare:on), but
1068 // incompatible command line options were chosen.
1069
1070 static void no_shared_spaces() {
1071 if (RequireSharedSpaces) {
1072 jio_fprintf(defaultStream::error_stream(),
1073 "Class data sharing is inconsistent with other specified options.\n");
1074 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1075 } else {
1076 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1077 }
1078 }
1079
1080 void Arguments::set_tiered_flags() {
1081 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1082 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1083 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1084 }
1085 if (CompilationPolicyChoice < 2) {
1086 vm_exit_during_initialization(
1087 "Incompatible compilation policy selected", NULL);
1088 }
1089 // Increase the code cache size - tiered compiles a lot more.
1090 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1091 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1092 }
1093 }
1094
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 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1106 // if it's not explictly set or unset. If the user has chosen
1107 // UseParNewGC and not explicitly set ParallelGCThreads we
1108 // set it, unless this is a single cpu machine.
1109 void Arguments::set_parnew_gc_flags() {
1110 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1111 "control point invariant");
1112 assert(UseParNewGC, "Error");
1113
1114 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1115 disable_adaptive_size_policy("UseParNewGC");
1116
1117 if (ParallelGCThreads == 0) {
1118 FLAG_SET_DEFAULT(ParallelGCThreads,
1119 Abstract_VM_Version::parallel_worker_threads());
1120 if (ParallelGCThreads == 1) {
1121 FLAG_SET_DEFAULT(UseParNewGC, false);
1122 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1123 }
1124 }
1125 if (UseParNewGC) {
1126 // CDS doesn't work with ParNew yet
1127 no_shared_spaces();
1128
1129 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1130 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1131 // we set them to 1024 and 1024.
1132 // See CR 6362902.
1133 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1134 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1135 }
1136 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1137 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1138 }
1139
1140 // AlwaysTenure flag should make ParNew promote all at first collection.
1141 // See CR 6362902.
1142 if (AlwaysTenure) {
1143 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1144 }
1145 // When using compressed oops, we use local overflow stacks,
1146 // rather than using a global overflow list chained through
1147 // the klass word of the object's pre-image.
1148 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1149 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1150 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1151 }
1152 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1153 }
1154 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1155 }
1156 }
1157
1158 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1159 // sparc/solaris for certain applications, but would gain from
1160 // further optimization and tuning efforts, and would almost
1161 // certainly gain from analysis of platform and environment.
1162 void Arguments::set_cms_and_parnew_gc_flags() {
1163 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1164 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1165
1166 // If we are using CMS, we prefer to UseParNewGC,
1167 // unless explicitly forbidden.
1168 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1169 FLAG_SET_ERGO(bool, UseParNewGC, true);
1170 }
1171
1172 // Turn off AdaptiveSizePolicy for CMS until it is complete.
1173 disable_adaptive_size_policy("UseConcMarkSweepGC");
1174
1175 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1176 // as needed.
1177 if (UseParNewGC) {
1178 set_parnew_gc_flags();
1179 }
1180
1181 size_t max_heap = align_size_down(MaxHeapSize,
1182 CardTableRS::ct_max_alignment_constraint());
1183
1184 // Now make adjustments for CMS
1185 intx tenuring_default = (intx)6;
1186 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1187
1188 // Preferred young gen size for "short" pauses:
1189 // upper bound depends on # of threads and NewRatio.
1190 const uintx parallel_gc_threads =
1191 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1192 const size_t preferred_max_new_size_unaligned =
1193 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1194 size_t preferred_max_new_size =
1195 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1196
1197 // Unless explicitly requested otherwise, size young gen
1198 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1199
1200 // If either MaxNewSize or NewRatio is set on the command line,
1201 // assume the user is trying to set the size of the young gen.
1202 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1203
1204 // Set MaxNewSize to our calculated preferred_max_new_size unless
1205 // NewSize was set on the command line and it is larger than
1206 // preferred_max_new_size.
1207 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1208 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1209 } else {
1210 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1211 }
1212 if (PrintGCDetails && Verbose) {
1213 // Too early to use gclog_or_tty
1214 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1215 }
1216
1217 // Code along this path potentially sets NewSize and OldSize
1218 if (PrintGCDetails && Verbose) {
1219 // Too early to use gclog_or_tty
1220 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1221 " initial_heap_size: " SIZE_FORMAT
1222 " max_heap: " SIZE_FORMAT,
1223 min_heap_size(), InitialHeapSize, max_heap);
1224 }
1225 size_t min_new = preferred_max_new_size;
1226 if (FLAG_IS_CMDLINE(NewSize)) {
1227 min_new = NewSize;
1228 }
1229 if (max_heap > min_new && min_heap_size() > min_new) {
1230 // Unless explicitly requested otherwise, make young gen
1231 // at least min_new, and at most preferred_max_new_size.
1232 if (FLAG_IS_DEFAULT(NewSize)) {
1233 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1234 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1235 if (PrintGCDetails && Verbose) {
1236 // Too early to use gclog_or_tty
1237 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1238 }
1239 }
1240 // Unless explicitly requested otherwise, size old gen
1241 // so it's NewRatio x of NewSize.
1242 if (FLAG_IS_DEFAULT(OldSize)) {
1243 if (max_heap > NewSize) {
1244 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1245 if (PrintGCDetails && Verbose) {
1246 // Too early to use gclog_or_tty
1247 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1248 }
1249 }
1250 }
1251 }
1252 }
1253 // Unless explicitly requested otherwise, definitely
1254 // promote all objects surviving "tenuring_default" scavenges.
1255 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1256 FLAG_IS_DEFAULT(SurvivorRatio)) {
1257 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1258 }
1259 // If we decided above (or user explicitly requested)
1260 // `promote all' (via MaxTenuringThreshold := 0),
1261 // prefer minuscule survivor spaces so as not to waste
1262 // space for (non-existent) survivors
1263 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1264 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1265 }
1266 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1267 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1268 // This is done in order to make ParNew+CMS configuration to work
1269 // with YoungPLABSize and OldPLABSize options.
1270 // See CR 6362902.
1271 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1272 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1273 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1274 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1275 // the value (either from the command line or ergonomics) of
1276 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1277 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1278 } else {
1279 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1280 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1281 // we'll let it to take precedence.
1282 jio_fprintf(defaultStream::error_stream(),
1283 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1284 " options are specified for the CMS collector."
1285 " CMSParPromoteBlocksToClaim will take precedence.\n");
1286 }
1287 }
1288 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1289 // OldPLAB sizing manually turned off: Use a larger default setting,
1290 // unless it was manually specified. This is because a too-low value
1291 // will slow down scavenges.
1292 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1293 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1294 }
1295 }
1296 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1297 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1298 // If either of the static initialization defaults have changed, note this
1299 // modification.
1300 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1301 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1302 }
1303 if (PrintGCDetails && Verbose) {
1304 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1305 MarkStackSize / K, MarkStackSizeMax / K);
1306 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1307 }
1308 }
1309
1310 void set_object_alignment() {
1311 // Object alignment.
1312 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1313 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1314 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1315 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1316 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1317 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1318
1319 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1320 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1321
1322 // Oop encoding heap max
1323 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1324
1325 // Set CMS global values
1326 CompactibleFreeListSpace::set_cms_values();
1327 }
1328
1329 bool verify_object_alignment() {
1330 // Object alignment.
1331 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1332 jio_fprintf(defaultStream::error_stream(),
1333 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1334 (int)ObjectAlignmentInBytes);
1335 return false;
1336 }
1337 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1338 jio_fprintf(defaultStream::error_stream(),
1339 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1340 (int)ObjectAlignmentInBytes, BytesPerLong);
1341 return false;
1342 }
1343 // It does not make sense to have big object alignment
1344 // since a space lost due to alignment will be greater
1345 // then a saved space from compressed oops.
1346 if ((int)ObjectAlignmentInBytes > 256) {
1347 jio_fprintf(defaultStream::error_stream(),
1348 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1349 (int)ObjectAlignmentInBytes);
1350 return false;
1351 }
1352 // In case page size is very small.
1353 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1354 jio_fprintf(defaultStream::error_stream(),
1355 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1356 (int)ObjectAlignmentInBytes, os::vm_page_size());
1357 return false;
1358 }
1359 return true;
1360 }
1361
1362 inline uintx max_heap_for_compressed_oops() {
1363 // Avoid sign flip.
1364 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1365 return 0;
1366 }
1367 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1368 NOT_LP64(ShouldNotReachHere(); return 0);
1369 }
1370
1371 bool Arguments::should_auto_select_low_pause_collector() {
1372 if (UseAutoGCSelectPolicy &&
1373 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1374 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1375 if (PrintGCDetails) {
1376 // Cannot use gclog_or_tty yet.
1377 tty->print_cr("Automatic selection of the low pause collector"
1378 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1379 }
1380 return true;
1381 }
1382 return false;
1383 }
1384
1385 void Arguments::set_ergonomics_flags() {
1386 // Parallel GC is not compatible with sharing. If one specifies
1387 // that they want sharing explicitly, do not set ergonomics flags.
1388 if (DumpSharedSpaces || RequireSharedSpaces) {
1389 return;
1390 }
1391
1392 if (os::is_server_class_machine()) {
1393 // If no other collector is requested explicitly,
1394 // let the VM select the collector based on
1395 // machine class and automatic selection policy.
1396 if (!UseSerialGC &&
1397 !UseConcMarkSweepGC &&
1398 !UseG1GC &&
1399 !UseParNewGC &&
1400 !DumpSharedSpaces &&
1401 FLAG_IS_DEFAULT(UseParallelGC)) {
1402 if (should_auto_select_low_pause_collector()) {
1403 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1404 } else {
1405 FLAG_SET_ERGO(bool, UseParallelGC, true);
1406 }
1407 no_shared_spaces();
1408 }
1409 }
1410
1411 #ifndef ZERO
1412 #ifdef _LP64
1413 // Check that UseCompressedOops can be set with the max heap size allocated
1414 // by ergonomics.
1415 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1416 #if !defined(COMPILER1) || defined(TIERED)
1417 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1418 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1419 }
1420 #endif
1421 #ifdef _WIN64
1422 if (UseLargePages && UseCompressedOops) {
1423 // Cannot allocate guard pages for implicit checks in indexed addressing
1424 // mode, when large pages are specified on windows.
1425 // This flag could be switched ON if narrow oop base address is set to 0,
1426 // see code in Universe::initialize_heap().
1427 Universe::set_narrow_oop_use_implicit_null_checks(false);
1428 }
1429 #endif // _WIN64
1430 } else {
1431 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1432 warning("Max heap size too large for Compressed Oops");
1433 FLAG_SET_DEFAULT(UseCompressedOops, false);
1434 }
1435 }
1436 // Also checks that certain machines are slower with compressed oops
1437 // in vm_version initialization code.
1438 #endif // _LP64
1439 #endif // !ZERO
1440 }
1441
1442 void Arguments::set_parallel_gc_flags() {
1443 assert(UseParallelGC || UseParallelOldGC, "Error");
1444 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1445 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1446 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1447 }
1448 FLAG_SET_DEFAULT(UseParallelGC, true);
1449
1450 if (UseAdaptiveSizePolicy) {
1451 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1452 // unless the user actually sets these flags.
1453 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1454 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1455 }
1456 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1457 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1458 }
1459 }
1460
1461 // If no heap maximum was requested explicitly, use some reasonable fraction
1462 // of the physical memory, up to a maximum of 1GB.
1463 if (UseParallelGC) {
1464 FLAG_SET_DEFAULT(ParallelGCThreads,
1465 Abstract_VM_Version::parallel_worker_threads());
1466
1467 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1468 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1469 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1470 // See CR 6362902 for details.
1471 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1472 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1473 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1474 }
1475 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1476 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1477 }
1478 }
1479
1480 if (UseParallelOldGC) {
1481 // Par compact uses lower default values since they are treated as
1482 // minimums. These are different defaults because of the different
1483 // interpretation and are not ergonomically set.
1484 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1485 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1486 }
1487 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1488 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1489 }
1490 }
1491 }
1492 if (UseNUMA) {
1493 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1494 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1495 }
1496 // For those collectors or operating systems (eg, Windows) that do
1497 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1498 UseNUMAInterleaving = true;
1499 }
1500 }
1501
1502 void Arguments::set_g1_gc_flags() {
1503 assert(UseG1GC, "Error");
1504 #ifdef COMPILER1
1505 FastTLABRefill = false;
1506 #endif
1507 FLAG_SET_DEFAULT(ParallelGCThreads,
1508 Abstract_VM_Version::parallel_worker_threads());
1509 if (ParallelGCThreads == 0) {
1510 FLAG_SET_DEFAULT(ParallelGCThreads,
1511 Abstract_VM_Version::parallel_worker_threads());
1512 }
1513 no_shared_spaces();
1514
1515 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1516 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1517 }
1518 if (PrintGCDetails && Verbose) {
1519 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1520 MarkStackSize / K, MarkStackSizeMax / K);
1521 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1522 }
1523
1524 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1525 // In G1, we want the default GC overhead goal to be higher than
1526 // say in PS. So we set it here to 10%. Otherwise the heap might
1527 // be expanded more aggressively than we would like it to. In
1528 // fact, even 10% seems to not be high enough in some cases
1529 // (especially small GC stress tests that the main thing they do
1530 // is allocation). We might consider increase it further.
1531 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1532 }
1533 }
1534
1535 void Arguments::set_heap_base_min_address() {
1536 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) {
1537 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86.
1538 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1
1539 // some extra space for the C-heap compared to other collectors.
1540 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that
1541 // code that checks for default values work correctly.
1542 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G);
1543 }
1544 }
1545
1546 void Arguments::set_heap_size() {
1547 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1548 // Deprecated flag
1549 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1550 }
1551
1552 const julong phys_mem =
1553 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1554 : (julong)MaxRAM;
1555
1556 // If the maximum heap size has not been set with -Xmx,
1557 // then set it as fraction of the size of physical memory,
1558 // respecting the maximum and minimum sizes of the heap.
1559 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1560 julong reasonable_max = phys_mem / MaxRAMFraction;
1561
1562 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1563 // Small physical memory, so use a minimum fraction of it for the heap
1564 reasonable_max = phys_mem / MinRAMFraction;
1565 } else {
1566 // Not-small physical memory, so require a heap at least
1567 // as large as MaxHeapSize
1568 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1569 }
1570 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1571 // Limit the heap size to ErgoHeapSizeLimit
1572 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1573 }
1574 if (UseCompressedOops) {
1575 // Limit the heap size to the maximum possible when using compressed oops
1576 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1577 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1578 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1579 // but it should be not less than default MaxHeapSize.
1580 max_coop_heap -= HeapBaseMinAddress;
1581 }
1582 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1583 }
1584 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1585
1586 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1587 // An initial heap size was specified on the command line,
1588 // so be sure that the maximum size is consistent. Done
1589 // after call to allocatable_physical_memory because that
1590 // method might reduce the allocation size.
1591 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1592 }
1593
1594 if (PrintGCDetails && Verbose) {
1595 // Cannot use gclog_or_tty yet.
1596 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1597 }
1598 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1599 }
1600
1601 // If the initial_heap_size has not been set with InitialHeapSize
1602 // or -Xms, then set it as fraction of the size of physical memory,
1603 // respecting the maximum and minimum sizes of the heap.
1604 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1605 julong reasonable_minimum = (julong)(OldSize + NewSize);
1606
1607 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1608
1609 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1610
1611 julong reasonable_initial = phys_mem / InitialRAMFraction;
1612
1613 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1614 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1615
1616 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1617
1618 if (PrintGCDetails && Verbose) {
1619 // Cannot use gclog_or_tty yet.
1620 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1621 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1622 }
1623 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1624 set_min_heap_size((uintx)reasonable_minimum);
1625 }
1626 }
1627
1628 // This must be called after ergonomics because we want bytecode rewriting
1629 // if the server compiler is used, or if UseSharedSpaces is disabled.
1630 void Arguments::set_bytecode_flags() {
1631 // Better not attempt to store into a read-only space.
1632 if (UseSharedSpaces) {
1633 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1634 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1635 }
1636
1637 if (!RewriteBytecodes) {
1638 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1639 }
1640 }
1641
1642 // Aggressive optimization flags -XX:+AggressiveOpts
1643 void Arguments::set_aggressive_opts_flags() {
1644 #ifdef COMPILER2
1645 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1646 // EliminateAutoBox code is broken in C2
1647 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1648 // FLAG_SET_DEFAULT(EliminateAutoBox, true);
1649 }
1650 if (EliminateAutoBox) {
1651 FLAG_SET_DEFAULT(EliminateAutoBox, false);
1652 }
1653 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1654 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1655 }
1656
1657 // Feed the cache size setting into the JDK
1658 char buffer[1024];
1659 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1660 add_property(buffer);
1661 }
1662 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1663 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1664 }
1665 #endif
1666
1667 if (AggressiveOpts) {
1668 // Sample flag setting code
1669 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1670 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1671 // }
1672 }
1673 }
1674
1675 //===========================================================================================================
1676 // Parsing of java.compiler property
1677
1678 void Arguments::process_java_compiler_argument(char* arg) {
1679 // For backwards compatibility, Djava.compiler=NONE or ""
1680 // causes us to switch to -Xint mode UNLESS -Xdebug
1681 // is also specified.
1682 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1683 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1684 }
1685 }
1686
1687 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1688 _sun_java_launcher = strdup(launcher);
1689 if (strcmp("gamma", _sun_java_launcher) == 0) {
1690 _created_by_gamma_launcher = true;
1691 }
1692 }
1693
1694 bool Arguments::created_by_java_launcher() {
1695 assert(_sun_java_launcher != NULL, "property must have value");
1696 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1697 }
1698
1699 bool Arguments::created_by_gamma_launcher() {
1700 return _created_by_gamma_launcher;
1701 }
1702
1703 //===========================================================================================================
1704 // Parsing of main arguments
1705
1706 bool Arguments::verify_interval(uintx val, uintx min,
1707 uintx max, const char* name) {
1708 // Returns true iff value is in the inclusive interval [min..max]
1709 // false, otherwise.
1710 if (val >= min && val <= max) {
1711 return true;
1712 }
1713 jio_fprintf(defaultStream::error_stream(),
1714 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1715 " and " UINTX_FORMAT "\n",
1716 name, val, min, max);
1717 return false;
1718 }
1719
1720 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1721 // Returns true if given value is at least specified min threshold
1722 // false, otherwise.
1723 if (val >= min ) {
1724 return true;
1725 }
1726 jio_fprintf(defaultStream::error_stream(),
1727 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1728 name, val, min);
1729 return false;
1730 }
1731
1732 bool Arguments::verify_percentage(uintx value, const char* name) {
1733 if (is_percentage(value)) {
1734 return true;
1735 }
1736 jio_fprintf(defaultStream::error_stream(),
1737 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1738 name, value);
1739 return false;
1740 }
1741
1742 static void force_serial_gc() {
1743 FLAG_SET_DEFAULT(UseSerialGC, true);
1744 FLAG_SET_DEFAULT(UseParNewGC, false);
1745 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1746 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1747 FLAG_SET_DEFAULT(UseParallelGC, false);
1748 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1749 FLAG_SET_DEFAULT(UseG1GC, false);
1750 }
1751
1752 static bool verify_serial_gc_flags() {
1753 return (UseSerialGC &&
1754 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1755 UseParallelGC || UseParallelOldGC));
1756 }
1757
1758 // check if do gclog rotation
1759 // +UseGCLogFileRotation is a must,
1760 // no gc log rotation when log file not supplied or
1761 // NumberOfGCLogFiles is 0
1762 void check_gclog_consistency() {
1763 if (UseGCLogFileRotation) {
1764 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1765 jio_fprintf(defaultStream::output_stream(),
1766 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1767 "where num_of_file > 0\n"
1768 "GC log rotation is turned off\n");
1769 UseGCLogFileRotation = false;
1770 }
1771 }
1772
1773 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1774 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1775 jio_fprintf(defaultStream::output_stream(),
1776 "GCLogFileSize changed to minimum 8K\n");
1777 }
1778 }
1779
1780 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1781 if (!is_percentage(min_heap_free_ratio)) {
1782 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1783 return false;
1784 }
1785 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1786 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1787 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1788 MaxHeapFreeRatio);
1789 return false;
1790 }
1791 return true;
1792 }
1793
1794 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1795 if (!is_percentage(max_heap_free_ratio)) {
1796 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1797 return false;
1798 }
1799 if (max_heap_free_ratio < MinHeapFreeRatio) {
1800 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1801 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1802 MinHeapFreeRatio);
1803 return false;
1804 }
1805 return true;
1806 }
1807
1808 // This function is called for -Xloggc:<filename>, it can be used
1809 // to check if a given file name(or string) conforms to the following
1810 // specification:
1811 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1812 // %p and %t only allowed once. We only limit usage of filename not path
1813 bool is_filename_valid(const char *file_name) {
1814 const char* p = file_name;
1815 char file_sep = os::file_separator()[0];
1816 const char* cp;
1817 // skip prefix path
1818 for (cp = file_name; *cp != '\0'; cp++) {
1819 if (*cp == '/' || *cp == file_sep) {
1820 p = cp + 1;
1821 }
1822 }
1823
1824 int count_p = 0;
1825 int count_t = 0;
1826 while (*p != '\0') {
1827 if ((*p >= '0' && *p <= '9') ||
1828 (*p >= 'A' && *p <= 'Z') ||
1829 (*p >= 'a' && *p <= 'z') ||
1830 *p == '-' ||
1831 *p == '_' ||
1832 *p == '.') {
1833 p++;
1834 continue;
1835 }
1836 if (*p == '%') {
1837 if(*(p + 1) == 'p') {
1838 p += 2;
1839 count_p ++;
1840 continue;
1841 }
1842 if (*(p + 1) == 't') {
1843 p += 2;
1844 count_t ++;
1845 continue;
1846 }
1847 }
1848 return false;
1849 }
1850 return count_p < 2 && count_t < 2;
1851 }
1852
1853 // Check consistency of GC selection
1854 bool Arguments::check_gc_consistency() {
1855 check_gclog_consistency();
1856 bool status = true;
1857 // Ensure that the user has not selected conflicting sets
1858 // of collectors. [Note: this check is merely a user convenience;
1859 // collectors over-ride each other so that only a non-conflicting
1860 // set is selected; however what the user gets is not what they
1861 // may have expected from the combination they asked for. It's
1862 // better to reduce user confusion by not allowing them to
1863 // select conflicting combinations.
1864 uint i = 0;
1865 if (UseSerialGC) i++;
1866 if (UseConcMarkSweepGC || UseParNewGC) i++;
1867 if (UseParallelGC || UseParallelOldGC) i++;
1868 if (UseG1GC) i++;
1869 if (i > 1) {
1870 jio_fprintf(defaultStream::error_stream(),
1871 "Conflicting collector combinations in option list; "
1872 "please refer to the release notes for the combinations "
1873 "allowed\n");
1874 status = false;
1875 }
1876
1877 return status;
1878 }
1879
1880 // Check stack pages settings
1881 bool Arguments::check_stack_pages()
1882 {
1883 bool status = true;
1884 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1885 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1886 // greater stack shadow pages can't generate instruction to bang stack
1887 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1888 return status;
1889 }
1890
1891 // Check the consistency of vm_init_args
1892 bool Arguments::check_vm_args_consistency() {
1893 // Method for adding checks for flag consistency.
1894 // The intent is to warn the user of all possible conflicts,
1895 // before returning an error.
1896 // Note: Needs platform-dependent factoring.
1897 bool status = true;
1898
1899 #if ( (defined(COMPILER2) && defined(SPARC)))
1900 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1901 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1902 // x86. Normally, VM_Version_init must be called from init_globals in
1903 // init.cpp, which is called by the initial java thread *after* arguments
1904 // have been parsed. VM_Version_init gets called twice on sparc.
1905 extern void VM_Version_init();
1906 VM_Version_init();
1907 if (!VM_Version::has_v9()) {
1908 jio_fprintf(defaultStream::error_stream(),
1909 "V8 Machine detected, Server requires V9\n");
1910 status = false;
1911 }
1912 #endif /* COMPILER2 && SPARC */
1913
1914 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1915 // builds so the cost of stack banging can be measured.
1916 #if (defined(PRODUCT) && defined(SOLARIS))
1917 if (!UseBoundThreads && !UseStackBanging) {
1918 jio_fprintf(defaultStream::error_stream(),
1919 "-UseStackBanging conflicts with -UseBoundThreads\n");
1920
1921 status = false;
1922 }
1923 #endif
1924
1925 if (TLABRefillWasteFraction == 0) {
1926 jio_fprintf(defaultStream::error_stream(),
1927 "TLABRefillWasteFraction should be a denominator, "
1928 "not " SIZE_FORMAT "\n",
1929 TLABRefillWasteFraction);
1930 status = false;
1931 }
1932
1933 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1934 "AdaptiveSizePolicyWeight");
1935 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1936 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1937
1938 {
1939 // Using "else if" below to avoid printing two error messages if min > max.
1940 // This will also prevent us from reporting both min>100 and max>100 at the
1941 // same time, but that is less annoying than printing two identical errors IMHO.
1942 FormatBuffer<80> err_msg("");
1943 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
1944 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
1945 status = false;
1946 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
1947 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
1948 status = false;
1949 }
1950 }
1951 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1952 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1953
1954 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1955 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1956 }
1957
1958 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1959 // Settings to encourage splitting.
1960 if (!FLAG_IS_CMDLINE(NewRatio)) {
1961 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1962 }
1963 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1964 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1965 }
1966 }
1967
1968 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1969 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1970 if (GCTimeLimit == 100) {
1971 // Turn off gc-overhead-limit-exceeded checks
1972 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1973 }
1974
1975 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1976
1977 status = status && check_gc_consistency();
1978 status = status && check_stack_pages();
1979
1980 if (_has_alloc_profile) {
1981 if (UseParallelGC || UseParallelOldGC) {
1982 jio_fprintf(defaultStream::error_stream(),
1983 "error: invalid argument combination.\n"
1984 "Allocation profiling (-Xaprof) cannot be used together with "
1985 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1986 status = false;
1987 }
1988 if (UseConcMarkSweepGC) {
1989 jio_fprintf(defaultStream::error_stream(),
1990 "error: invalid argument combination.\n"
1991 "Allocation profiling (-Xaprof) cannot be used together with "
1992 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1993 status = false;
1994 }
1995 }
1996
1997 if (CMSIncrementalMode) {
1998 if (!UseConcMarkSweepGC) {
1999 jio_fprintf(defaultStream::error_stream(),
2000 "error: invalid argument combination.\n"
2001 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2002 "selected in order\nto use CMSIncrementalMode.\n");
2003 status = false;
2004 } else {
2005 status = status && verify_percentage(CMSIncrementalDutyCycle,
2006 "CMSIncrementalDutyCycle");
2007 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2008 "CMSIncrementalDutyCycleMin");
2009 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2010 "CMSIncrementalSafetyFactor");
2011 status = status && verify_percentage(CMSIncrementalOffset,
2012 "CMSIncrementalOffset");
2013 status = status && verify_percentage(CMSExpAvgFactor,
2014 "CMSExpAvgFactor");
2015 // If it was not set on the command line, set
2016 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2017 if (CMSInitiatingOccupancyFraction < 0) {
2018 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2019 }
2020 }
2021 }
2022
2023 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2024 // insists that we hold the requisite locks so that the iteration is
2025 // MT-safe. For the verification at start-up and shut-down, we don't
2026 // yet have a good way of acquiring and releasing these locks,
2027 // which are not visible at the CollectedHeap level. We want to
2028 // be able to acquire these locks and then do the iteration rather
2029 // than just disable the lock verification. This will be fixed under
2030 // bug 4788986.
2031 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2032 if (VerifyDuringStartup) {
2033 warning("Heap verification at start-up disabled "
2034 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2035 VerifyDuringStartup = false; // Disable verification at start-up
2036 }
2037
2038 if (VerifyBeforeExit) {
2039 warning("Heap verification at shutdown disabled "
2040 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2041 VerifyBeforeExit = false; // Disable verification at shutdown
2042 }
2043 }
2044
2045 // Note: only executed in non-PRODUCT mode
2046 if (!UseAsyncConcMarkSweepGC &&
2047 (ExplicitGCInvokesConcurrent ||
2048 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2049 jio_fprintf(defaultStream::error_stream(),
2050 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2051 " with -UseAsyncConcMarkSweepGC");
2052 status = false;
2053 }
2054
2055 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2056
2057 #ifndef SERIALGC
2058 if (UseG1GC) {
2059 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2060 "InitiatingHeapOccupancyPercent");
2061 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2062 "G1RefProcDrainInterval");
2063 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2064 "G1ConcMarkStepDurationMillis");
2065 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2066 "G1ConcRSHotCardLimit");
2067 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2068 "G1ConcRSLogCacheSize");
2069 }
2070 #endif
2071
2072 status = status && verify_interval(RefDiscoveryPolicy,
2073 ReferenceProcessor::DiscoveryPolicyMin,
2074 ReferenceProcessor::DiscoveryPolicyMax,
2075 "RefDiscoveryPolicy");
2076
2077 // Limit the lower bound of this flag to 1 as it is used in a division
2078 // expression.
2079 status = status && verify_interval(TLABWasteTargetPercent,
2080 1, 100, "TLABWasteTargetPercent");
2081
2082 status = status && verify_object_alignment();
2083 #ifdef COMPILER1
2084 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2085 #endif
2086
2087 #ifdef SPARC
2088 if (UseConcMarkSweepGC || UseG1GC) {
2089 // Issue a stern warning if the user has explicitly set
2090 // UseMemSetInBOT (it is known to cause issues), but allow
2091 // use for experimentation and debugging.
2092 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2093 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2094 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2095 " on sun4v; please understand that you are using at your own risk!");
2096 }
2097 }
2098 #endif // SPARC
2099
2100 // check native memory tracking flags
2101 if (PrintNMTStatistics && MemTracker::tracking_level() == MemTracker::NMT_off) {
2102 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2103 PrintNMTStatistics = false;
2104 }
2105
2106 return status;
2107 }
2108
2109 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2110 const char* option_type) {
2111 if (ignore) return false;
2112
2113 const char* spacer = " ";
2114 if (option_type == NULL) {
2115 option_type = ++spacer; // Set both to the empty string.
2116 }
2117
2118 if (os::obsolete_option(option)) {
2119 jio_fprintf(defaultStream::error_stream(),
2120 "Obsolete %s%soption: %s\n", option_type, spacer,
2121 option->optionString);
2122 return false;
2123 } else {
2124 jio_fprintf(defaultStream::error_stream(),
2125 "Unrecognized %s%soption: %s\n", option_type, spacer,
2126 option->optionString);
2127 return true;
2128 }
2129 }
2130
2131 static const char* user_assertion_options[] = {
2132 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2133 };
2134
2135 static const char* system_assertion_options[] = {
2136 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2137 };
2138
2139 // Return true if any of the strings in null-terminated array 'names' matches.
2140 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2141 // the option must match exactly.
2142 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2143 bool tail_allowed) {
2144 for (/* empty */; *names != NULL; ++names) {
2145 if (match_option(option, *names, tail)) {
2146 if (**tail == '\0' || tail_allowed && **tail == ':') {
2147 return true;
2148 }
2149 }
2150 }
2151 return false;
2152 }
2153
2154 bool Arguments::parse_uintx(const char* value,
2155 uintx* uintx_arg,
2156 uintx min_size) {
2157
2158 // Check the sign first since atomull() parses only unsigned values.
2159 bool value_is_positive = !(*value == '-');
2160
2161 if (value_is_positive) {
2162 julong n;
2163 bool good_return = atomull(value, &n);
2164 if (good_return) {
2165 bool above_minimum = n >= min_size;
2166 bool value_is_too_large = n > max_uintx;
2167
2168 if (above_minimum && !value_is_too_large) {
2169 *uintx_arg = n;
2170 return true;
2171 }
2172 }
2173 }
2174 return false;
2175 }
2176
2177 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2178 julong* long_arg,
2179 julong min_size) {
2180 if (!atomull(s, long_arg)) return arg_unreadable;
2181 return check_memory_size(*long_arg, min_size);
2182 }
2183
2184 // Parse JavaVMInitArgs structure
2185
2186 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2187 // For components of the system classpath.
2188 SysClassPath scp(Arguments::get_sysclasspath());
2189 bool scp_assembly_required = false;
2190
2191 // Save default settings for some mode flags
2192 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2193 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2194 Arguments::_ClipInlining = ClipInlining;
2195 Arguments::_BackgroundCompilation = BackgroundCompilation;
2196
2197 // Setup flags for mixed which is the default
2198 set_mode_flags(_mixed);
2199
2200 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2201 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2202 if (result != JNI_OK) {
2203 return result;
2204 }
2205
2206 // Parse JavaVMInitArgs structure passed in
2207 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2208 if (result != JNI_OK) {
2209 return result;
2210 }
2211
2212 if (AggressiveOpts) {
2213 // Insert alt-rt.jar between user-specified bootclasspath
2214 // prefix and the default bootclasspath. os::set_boot_path()
2215 // uses meta_index_dir as the default bootclasspath directory.
2216 const char* altclasses_jar = "alt-rt.jar";
2217 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2218 strlen(altclasses_jar);
2219 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2220 strcpy(altclasses_path, get_meta_index_dir());
2221 strcat(altclasses_path, altclasses_jar);
2222 scp.add_suffix_to_prefix(altclasses_path);
2223 scp_assembly_required = true;
2224 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2225 }
2226
2227 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2228 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2229 if (result != JNI_OK) {
2230 return result;
2231 }
2232
2233 // Do final processing now that all arguments have been parsed
2234 result = finalize_vm_init_args(&scp, scp_assembly_required);
2235 if (result != JNI_OK) {
2236 return result;
2237 }
2238
2239 return JNI_OK;
2240 }
2241
2242 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2243 SysClassPath* scp_p,
2244 bool* scp_assembly_required_p,
2245 FlagValueOrigin origin) {
2246 // Remaining part of option string
2247 const char* tail;
2248
2249 // iterate over arguments
2250 for (int index = 0; index < args->nOptions; index++) {
2251 bool is_absolute_path = false; // for -agentpath vs -agentlib
2252
2253 const JavaVMOption* option = args->options + index;
2254
2255 if (!match_option(option, "-Djava.class.path", &tail) &&
2256 !match_option(option, "-Dsun.java.command", &tail) &&
2257 !match_option(option, "-Dsun.java.launcher", &tail)) {
2258
2259 // add all jvm options to the jvm_args string. This string
2260 // is used later to set the java.vm.args PerfData string constant.
2261 // the -Djava.class.path and the -Dsun.java.command options are
2262 // omitted from jvm_args string as each have their own PerfData
2263 // string constant object.
2264 build_jvm_args(option->optionString);
2265 }
2266
2267 // -verbose:[class/gc/jni]
2268 if (match_option(option, "-verbose", &tail)) {
2269 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2270 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2271 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2272 } else if (!strcmp(tail, ":gc")) {
2273 FLAG_SET_CMDLINE(bool, PrintGC, true);
2274 } else if (!strcmp(tail, ":jni")) {
2275 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2276 }
2277 // -da / -ea / -disableassertions / -enableassertions
2278 // These accept an optional class/package name separated by a colon, e.g.,
2279 // -da:java.lang.Thread.
2280 } else if (match_option(option, user_assertion_options, &tail, true)) {
2281 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2282 if (*tail == '\0') {
2283 JavaAssertions::setUserClassDefault(enable);
2284 } else {
2285 assert(*tail == ':', "bogus match by match_option()");
2286 JavaAssertions::addOption(tail + 1, enable);
2287 }
2288 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2289 } else if (match_option(option, system_assertion_options, &tail, false)) {
2290 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2291 JavaAssertions::setSystemClassDefault(enable);
2292 // -bootclasspath:
2293 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2294 scp_p->reset_path(tail);
2295 *scp_assembly_required_p = true;
2296 // -bootclasspath/a:
2297 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2298 scp_p->add_suffix(tail);
2299 *scp_assembly_required_p = true;
2300 // -bootclasspath/p:
2301 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2302 scp_p->add_prefix(tail);
2303 *scp_assembly_required_p = true;
2304 // -Xrun
2305 } else if (match_option(option, "-Xrun", &tail)) {
2306 if (tail != NULL) {
2307 const char* pos = strchr(tail, ':');
2308 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2309 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2310 name[len] = '\0';
2311
2312 char *options = NULL;
2313 if(pos != NULL) {
2314 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2315 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2316 }
2317 add_init_library(name, options);
2318 }
2319 // -agentlib and -agentpath
2320 } else if (match_option(option, "-agentlib:", &tail) ||
2321 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2322 if(tail != NULL) {
2323 const char* pos = strchr(tail, '=');
2324 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2325 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2326 name[len] = '\0';
2327
2328 char *options = NULL;
2329 if(pos != NULL) {
2330 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2331 }
2332 add_init_agent(name, options, is_absolute_path);
2333
2334 }
2335 // -javaagent
2336 } else if (match_option(option, "-javaagent:", &tail)) {
2337 if(tail != NULL) {
2338 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2339 add_init_agent("instrument", options, false);
2340 }
2341 // -Xnoclassgc
2342 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2343 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2344 // -Xincgc: i-CMS
2345 } else if (match_option(option, "-Xincgc", &tail)) {
2346 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2347 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2348 // -Xnoincgc: no i-CMS
2349 } else if (match_option(option, "-Xnoincgc", &tail)) {
2350 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2351 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2352 // -Xconcgc
2353 } else if (match_option(option, "-Xconcgc", &tail)) {
2354 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2355 // -Xnoconcgc
2356 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2357 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2358 // -Xbatch
2359 } else if (match_option(option, "-Xbatch", &tail)) {
2360 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2361 // -Xmn for compatibility with other JVM vendors
2362 } else if (match_option(option, "-Xmn", &tail)) {
2363 julong long_initial_eden_size = 0;
2364 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2365 if (errcode != arg_in_range) {
2366 jio_fprintf(defaultStream::error_stream(),
2367 "Invalid initial eden size: %s\n", option->optionString);
2368 describe_range_error(errcode);
2369 return JNI_EINVAL;
2370 }
2371 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2372 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2373 // -Xms
2374 } else if (match_option(option, "-Xms", &tail)) {
2375 julong long_initial_heap_size = 0;
2376 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2377 if (errcode != arg_in_range) {
2378 jio_fprintf(defaultStream::error_stream(),
2379 "Invalid initial heap size: %s\n", option->optionString);
2380 describe_range_error(errcode);
2381 return JNI_EINVAL;
2382 }
2383 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2384 // Currently the minimum size and the initial heap sizes are the same.
2385 set_min_heap_size(InitialHeapSize);
2386 // -Xmx
2387 } else if (match_option(option, "-Xmx", &tail)) {
2388 julong long_max_heap_size = 0;
2389 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2390 if (errcode != arg_in_range) {
2391 jio_fprintf(defaultStream::error_stream(),
2392 "Invalid maximum heap size: %s\n", option->optionString);
2393 describe_range_error(errcode);
2394 return JNI_EINVAL;
2395 }
2396 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2397 // Xmaxf
2398 } else if (match_option(option, "-Xmaxf", &tail)) {
2399 int maxf = (int)(atof(tail) * 100);
2400 if (maxf < 0 || maxf > 100) {
2401 jio_fprintf(defaultStream::error_stream(),
2402 "Bad max heap free percentage size: %s\n",
2403 option->optionString);
2404 return JNI_EINVAL;
2405 } else {
2406 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2407 }
2408 // Xminf
2409 } else if (match_option(option, "-Xminf", &tail)) {
2410 int minf = (int)(atof(tail) * 100);
2411 if (minf < 0 || minf > 100) {
2412 jio_fprintf(defaultStream::error_stream(),
2413 "Bad min heap free percentage size: %s\n",
2414 option->optionString);
2415 return JNI_EINVAL;
2416 } else {
2417 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2418 }
2419 // -Xss
2420 } else if (match_option(option, "-Xss", &tail)) {
2421 julong long_ThreadStackSize = 0;
2422 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2423 if (errcode != arg_in_range) {
2424 jio_fprintf(defaultStream::error_stream(),
2425 "Invalid thread stack size: %s\n", option->optionString);
2426 describe_range_error(errcode);
2427 return JNI_EINVAL;
2428 }
2429 // Internally track ThreadStackSize in units of 1024 bytes.
2430 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2431 round_to((int)long_ThreadStackSize, K) / K);
2432 // -Xoss
2433 } else if (match_option(option, "-Xoss", &tail)) {
2434 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2435 // -Xmaxjitcodesize
2436 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2437 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2438 julong long_ReservedCodeCacheSize = 0;
2439 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2440 (size_t)InitialCodeCacheSize);
2441 if (errcode != arg_in_range) {
2442 jio_fprintf(defaultStream::error_stream(),
2443 "Invalid maximum code cache size: %s. Should be greater than or equal to InitialCodeCacheSize=%dK\n",
2444 option->optionString, InitialCodeCacheSize/K);
2445 describe_range_error(errcode);
2446 return JNI_EINVAL;
2447 }
2448 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2449 // -green
2450 } else if (match_option(option, "-green", &tail)) {
2451 jio_fprintf(defaultStream::error_stream(),
2452 "Green threads support not available\n");
2453 return JNI_EINVAL;
2454 // -native
2455 } else if (match_option(option, "-native", &tail)) {
2456 // HotSpot always uses native threads, ignore silently for compatibility
2457 // -Xsqnopause
2458 } else if (match_option(option, "-Xsqnopause", &tail)) {
2459 // EVM option, ignore silently for compatibility
2460 // -Xrs
2461 } else if (match_option(option, "-Xrs", &tail)) {
2462 // Classic/EVM option, new functionality
2463 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2464 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2465 // change default internal VM signals used - lower case for back compat
2466 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2467 // -Xoptimize
2468 } else if (match_option(option, "-Xoptimize", &tail)) {
2469 // EVM option, ignore silently for compatibility
2470 // -Xprof
2471 } else if (match_option(option, "-Xprof", &tail)) {
2472 _has_profile = true;
2473 // -Xaprof
2474 } else if (match_option(option, "-Xaprof", &tail)) {
2475 _has_alloc_profile = true;
2476 // -Xconcurrentio
2477 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2478 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2479 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2480 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2481 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2482 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2483
2484 // -Xinternalversion
2485 } else if (match_option(option, "-Xinternalversion", &tail)) {
2486 jio_fprintf(defaultStream::output_stream(), "%s\n",
2487 VM_Version::internal_vm_info_string());
2488 vm_exit(0);
2489 #ifndef PRODUCT
2490 // -Xprintflags
2491 } else if (match_option(option, "-Xprintflags", &tail)) {
2492 CommandLineFlags::printFlags(tty, false);
2493 vm_exit(0);
2494 #endif
2495 // -D
2496 } else if (match_option(option, "-D", &tail)) {
2497 if (!add_property(tail)) {
2498 return JNI_ENOMEM;
2499 }
2500 // Out of the box management support
2501 if (match_option(option, "-Dcom.sun.management", &tail)) {
2502 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2503 }
2504 // -Xint
2505 } else if (match_option(option, "-Xint", &tail)) {
2506 set_mode_flags(_int);
2507 // -Xmixed
2508 } else if (match_option(option, "-Xmixed", &tail)) {
2509 set_mode_flags(_mixed);
2510 // -Xcomp
2511 } else if (match_option(option, "-Xcomp", &tail)) {
2512 // for testing the compiler; turn off all flags that inhibit compilation
2513 set_mode_flags(_comp);
2514
2515 // -Xshare:dump
2516 } else if (match_option(option, "-Xshare:dump", &tail)) {
2517 #ifdef TIERED
2518 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2519 set_mode_flags(_int); // Prevent compilation, which creates objects
2520 #elif defined(COMPILER2)
2521 vm_exit_during_initialization(
2522 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2523 #else
2524 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2525 set_mode_flags(_int); // Prevent compilation, which creates objects
2526 #endif
2527 // -Xshare:on
2528 } else if (match_option(option, "-Xshare:on", &tail)) {
2529 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2530 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2531 // -Xshare:auto
2532 } else if (match_option(option, "-Xshare:auto", &tail)) {
2533 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2534 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2535 // -Xshare:off
2536 } else if (match_option(option, "-Xshare:off", &tail)) {
2537 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2538 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2539
2540 // -Xverify
2541 } else if (match_option(option, "-Xverify", &tail)) {
2542 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2543 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2544 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2545 } else if (strcmp(tail, ":remote") == 0) {
2546 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2547 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2548 } else if (strcmp(tail, ":none") == 0) {
2549 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2550 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2551 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2552 return JNI_EINVAL;
2553 }
2554 // -Xdebug
2555 } else if (match_option(option, "-Xdebug", &tail)) {
2556 // note this flag has been used, then ignore
2557 set_xdebug_mode(true);
2558 // -Xnoagent
2559 } else if (match_option(option, "-Xnoagent", &tail)) {
2560 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2561 } else if (match_option(option, "-Xboundthreads", &tail)) {
2562 // Bind user level threads to kernel threads (Solaris only)
2563 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2564 } else if (match_option(option, "-Xloggc:", &tail)) {
2565 // Redirect GC output to the file. -Xloggc:<filename>
2566 // ostream_init_log(), when called will use this filename
2567 // to initialize a fileStream.
2568 _gc_log_filename = strdup(tail);
2569 if (!is_filename_valid(_gc_log_filename)) {
2570 jio_fprintf(defaultStream::output_stream(),
2571 "Invalid file name for use with -Xloggc: Filename can only contain the "
2572 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2573 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2574 return JNI_EINVAL;
2575 }
2576 FLAG_SET_CMDLINE(bool, PrintGC, true);
2577 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2578
2579 // JNI hooks
2580 } else if (match_option(option, "-Xcheck", &tail)) {
2581 if (!strcmp(tail, ":jni")) {
2582 CheckJNICalls = true;
2583 } else if (is_bad_option(option, args->ignoreUnrecognized,
2584 "check")) {
2585 return JNI_EINVAL;
2586 }
2587 } else if (match_option(option, "vfprintf", &tail)) {
2588 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2589 } else if (match_option(option, "exit", &tail)) {
2590 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2591 } else if (match_option(option, "abort", &tail)) {
2592 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2593 // -XX:+AggressiveHeap
2594 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2595
2596 // This option inspects the machine and attempts to set various
2597 // parameters to be optimal for long-running, memory allocation
2598 // intensive jobs. It is intended for machines with large
2599 // amounts of cpu and memory.
2600
2601 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2602 // VM, but we may not be able to represent the total physical memory
2603 // available (like having 8gb of memory on a box but using a 32bit VM).
2604 // Thus, we need to make sure we're using a julong for intermediate
2605 // calculations.
2606 julong initHeapSize;
2607 julong total_memory = os::physical_memory();
2608
2609 if (total_memory < (julong)256*M) {
2610 jio_fprintf(defaultStream::error_stream(),
2611 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2612 vm_exit(1);
2613 }
2614
2615 // The heap size is half of available memory, or (at most)
2616 // all of possible memory less 160mb (leaving room for the OS
2617 // when using ISM). This is the maximum; because adaptive sizing
2618 // is turned on below, the actual space used may be smaller.
2619
2620 initHeapSize = MIN2(total_memory / (julong)2,
2621 total_memory - (julong)160*M);
2622
2623 // Make sure that if we have a lot of memory we cap the 32 bit
2624 // process space. The 64bit VM version of this function is a nop.
2625 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2626
2627 // The perm gen is separate but contiguous with the
2628 // object heap (and is reserved with it) so subtract it
2629 // from the heap size.
2630 if (initHeapSize > MaxPermSize) {
2631 initHeapSize = initHeapSize - MaxPermSize;
2632 } else {
2633 warning("AggressiveHeap and MaxPermSize values may conflict");
2634 }
2635
2636 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2637 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2638 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2639 // Currently the minimum size and the initial heap sizes are the same.
2640 set_min_heap_size(initHeapSize);
2641 }
2642 if (FLAG_IS_DEFAULT(NewSize)) {
2643 // Make the young generation 3/8ths of the total heap.
2644 FLAG_SET_CMDLINE(uintx, NewSize,
2645 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2646 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2647 }
2648
2649 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2650 FLAG_SET_DEFAULT(UseLargePages, true);
2651 #endif
2652
2653 // Increase some data structure sizes for efficiency
2654 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2655 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2656 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2657
2658 // See the OldPLABSize comment below, but replace 'after promotion'
2659 // with 'after copying'. YoungPLABSize is the size of the survivor
2660 // space per-gc-thread buffers. The default is 4kw.
2661 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2662
2663 // OldPLABSize is the size of the buffers in the old gen that
2664 // UseParallelGC uses to promote live data that doesn't fit in the
2665 // survivor spaces. At any given time, there's one for each gc thread.
2666 // The default size is 1kw. These buffers are rarely used, since the
2667 // survivor spaces are usually big enough. For specjbb, however, there
2668 // are occasions when there's lots of live data in the young gen
2669 // and we end up promoting some of it. We don't have a definite
2670 // explanation for why bumping OldPLABSize helps, but the theory
2671 // is that a bigger PLAB results in retaining something like the
2672 // original allocation order after promotion, which improves mutator
2673 // locality. A minor effect may be that larger PLABs reduce the
2674 // number of PLAB allocation events during gc. The value of 8kw
2675 // was arrived at by experimenting with specjbb.
2676 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2677
2678 // Enable parallel GC and adaptive generation sizing
2679 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2680 FLAG_SET_DEFAULT(ParallelGCThreads,
2681 Abstract_VM_Version::parallel_worker_threads());
2682
2683 // Encourage steady state memory management
2684 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2685
2686 // This appears to improve mutator locality
2687 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2688
2689 // Get around early Solaris scheduling bug
2690 // (affinity vs other jobs on system)
2691 // but disallow DR and offlining (5008695).
2692 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2693
2694 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2695 // The last option must always win.
2696 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2697 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2698 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2699 // The last option must always win.
2700 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2701 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2702 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2703 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2704 jio_fprintf(defaultStream::error_stream(),
2705 "Please use CMSClassUnloadingEnabled in place of "
2706 "CMSPermGenSweepingEnabled in the future\n");
2707 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2708 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2709 jio_fprintf(defaultStream::error_stream(),
2710 "Please use -XX:+UseGCOverheadLimit in place of "
2711 "-XX:+UseGCTimeLimit in the future\n");
2712 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2713 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2714 jio_fprintf(defaultStream::error_stream(),
2715 "Please use -XX:-UseGCOverheadLimit in place of "
2716 "-XX:-UseGCTimeLimit in the future\n");
2717 // The TLE options are for compatibility with 1.3 and will be
2718 // removed without notice in a future release. These options
2719 // are not to be documented.
2720 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2721 // No longer used.
2722 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2723 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2724 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2725 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2726 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2727 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2728 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2729 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2730 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2731 // No longer used.
2732 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2733 julong long_tlab_size = 0;
2734 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2735 if (errcode != arg_in_range) {
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Invalid TLAB size: %s\n", option->optionString);
2738 describe_range_error(errcode);
2739 return JNI_EINVAL;
2740 }
2741 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2742 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2743 // No longer used.
2744 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2745 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2746 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2747 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2748 SOLARIS_ONLY(
2749 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2750 warning("-XX:+UsePermISM is obsolete.");
2751 FLAG_SET_CMDLINE(bool, UseISM, true);
2752 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2753 FLAG_SET_CMDLINE(bool, UseISM, false);
2754 )
2755 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2756 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2757 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2758 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2759 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2760 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2761 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2762 #if defined(DTRACE_ENABLED)
2763 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2764 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2765 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2766 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2767 #else // defined(DTRACE_ENABLED)
2768 jio_fprintf(defaultStream::error_stream(),
2769 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2770 return JNI_EINVAL;
2771 #endif // defined(DTRACE_ENABLED)
2772 #ifdef ASSERT
2773 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2774 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2775 // disable scavenge before parallel mark-compact
2776 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2777 #endif
2778 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2779 julong cms_blocks_to_claim = (julong)atol(tail);
2780 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2781 jio_fprintf(defaultStream::error_stream(),
2782 "Please use -XX:OldPLABSize in place of "
2783 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2784 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2785 julong cms_blocks_to_claim = (julong)atol(tail);
2786 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2787 jio_fprintf(defaultStream::error_stream(),
2788 "Please use -XX:OldPLABSize in place of "
2789 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2790 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2791 julong old_plab_size = 0;
2792 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2793 if (errcode != arg_in_range) {
2794 jio_fprintf(defaultStream::error_stream(),
2795 "Invalid old PLAB size: %s\n", option->optionString);
2796 describe_range_error(errcode);
2797 return JNI_EINVAL;
2798 }
2799 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2800 jio_fprintf(defaultStream::error_stream(),
2801 "Please use -XX:OldPLABSize in place of "
2802 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2803 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2804 julong young_plab_size = 0;
2805 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2806 if (errcode != arg_in_range) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Invalid young PLAB size: %s\n", option->optionString);
2809 describe_range_error(errcode);
2810 return JNI_EINVAL;
2811 }
2812 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2813 jio_fprintf(defaultStream::error_stream(),
2814 "Please use -XX:YoungPLABSize in place of "
2815 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2816 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2817 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2818 julong stack_size = 0;
2819 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2820 if (errcode != arg_in_range) {
2821 jio_fprintf(defaultStream::error_stream(),
2822 "Invalid mark stack size: %s\n", option->optionString);
2823 describe_range_error(errcode);
2824 return JNI_EINVAL;
2825 }
2826 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2827 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2828 julong max_stack_size = 0;
2829 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2830 if (errcode != arg_in_range) {
2831 jio_fprintf(defaultStream::error_stream(),
2832 "Invalid maximum mark stack size: %s\n",
2833 option->optionString);
2834 describe_range_error(errcode);
2835 return JNI_EINVAL;
2836 }
2837 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2838 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2839 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2840 uintx conc_threads = 0;
2841 if (!parse_uintx(tail, &conc_threads, 1)) {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Invalid concurrent threads: %s\n", option->optionString);
2844 return JNI_EINVAL;
2845 }
2846 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2847 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2848 julong max_direct_memory_size = 0;
2849 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2850 if (errcode != arg_in_range) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid maximum direct memory size: %s\n",
2853 option->optionString);
2854 describe_range_error(errcode);
2855 return JNI_EINVAL;
2856 }
2857 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2858 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2859 // Skip -XX:Flags= since that case has already been handled
2860 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2861 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2862 return JNI_EINVAL;
2863 }
2864 }
2865 // Unknown option
2866 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2867 return JNI_ERR;
2868 }
2869 }
2870
2871 // Change the default value for flags which have different default values
2872 // when working with older JDKs.
2873 if (JDK_Version::current().compare_major(6) <= 0 &&
2874 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2875 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2876 }
2877 #ifdef LINUX
2878 if (JDK_Version::current().compare_major(6) <= 0 &&
2879 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2880 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2881 }
2882 #endif // LINUX
2883 return JNI_OK;
2884 }
2885
2886 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2887 // This must be done after all -D arguments have been processed.
2888 scp_p->expand_endorsed();
2889
2890 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2891 // Assemble the bootclasspath elements into the final path.
2892 Arguments::set_sysclasspath(scp_p->combined_path());
2893 }
2894
2895 // This must be done after all arguments have been processed.
2896 // java_compiler() true means set to "NONE" or empty.
2897 if (java_compiler() && !xdebug_mode()) {
2898 // For backwards compatibility, we switch to interpreted mode if
2899 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2900 // not specified.
2901 set_mode_flags(_int);
2902 }
2903 if (CompileThreshold == 0) {
2904 set_mode_flags(_int);
2905 }
2906
2907 #ifndef COMPILER2
2908 // Don't degrade server performance for footprint
2909 if (FLAG_IS_DEFAULT(UseLargePages) &&
2910 MaxHeapSize < LargePageHeapSizeThreshold) {
2911 // No need for large granularity pages w/small heaps.
2912 // Note that large pages are enabled/disabled for both the
2913 // Java heap and the code cache.
2914 FLAG_SET_DEFAULT(UseLargePages, false);
2915 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2916 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2917 }
2918
2919 // Tiered compilation is undefined with C1.
2920 TieredCompilation = false;
2921 #else
2922 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2923 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2924 }
2925 #endif
2926
2927 // If we are running in a headless jre, force java.awt.headless property
2928 // to be true unless the property has already been set.
2929 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2930 if (os::is_headless_jre()) {
2931 const char* headless = Arguments::get_property("java.awt.headless");
2932 if (headless == NULL) {
2933 char envbuffer[128];
2934 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2935 if (!add_property("java.awt.headless=true")) {
2936 return JNI_ENOMEM;
2937 }
2938 } else {
2939 char buffer[256];
2940 strcpy(buffer, "java.awt.headless=");
2941 strcat(buffer, envbuffer);
2942 if (!add_property(buffer)) {
2943 return JNI_ENOMEM;
2944 }
2945 }
2946 }
2947 }
2948
2949 if (!check_vm_args_consistency()) {
2950 return JNI_ERR;
2951 }
2952
2953 return JNI_OK;
2954 }
2955
2956 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2957 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2958 scp_assembly_required_p);
2959 }
2960
2961 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2962 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2963 scp_assembly_required_p);
2964 }
2965
2966 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2967 const int N_MAX_OPTIONS = 64;
2968 const int OPTION_BUFFER_SIZE = 1024;
2969 char buffer[OPTION_BUFFER_SIZE];
2970
2971 // The variable will be ignored if it exceeds the length of the buffer.
2972 // Don't check this variable if user has special privileges
2973 // (e.g. unix su command).
2974 if (os::getenv(name, buffer, sizeof(buffer)) &&
2975 !os::have_special_privileges()) {
2976 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2977 jio_fprintf(defaultStream::error_stream(),
2978 "Picked up %s: %s\n", name, buffer);
2979 char* rd = buffer; // pointer to the input string (rd)
2980 int i;
2981 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2982 while (isspace(*rd)) rd++; // skip whitespace
2983 if (*rd == 0) break; // we re done when the input string is read completely
2984
2985 // The output, option string, overwrites the input string.
2986 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2987 // input string (rd).
2988 char* wrt = rd;
2989
2990 options[i++].optionString = wrt; // Fill in option
2991 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2992 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2993 int quote = *rd; // matching quote to look for
2994 rd++; // don't copy open quote
2995 while (*rd != quote) { // include everything (even spaces) up until quote
2996 if (*rd == 0) { // string termination means unmatched string
2997 jio_fprintf(defaultStream::error_stream(),
2998 "Unmatched quote in %s\n", name);
2999 return JNI_ERR;
3000 }
3001 *wrt++ = *rd++; // copy to option string
3002 }
3003 rd++; // don't copy close quote
3004 } else {
3005 *wrt++ = *rd++; // copy to option string
3006 }
3007 }
3008 // Need to check if we're done before writing a NULL,
3009 // because the write could be to the byte that rd is pointing to.
3010 if (*rd++ == 0) {
3011 *wrt = 0;
3012 break;
3013 }
3014 *wrt = 0; // Zero terminate option
3015 }
3016 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3017 JavaVMInitArgs vm_args;
3018 vm_args.version = JNI_VERSION_1_2;
3019 vm_args.options = options;
3020 vm_args.nOptions = i;
3021 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3022
3023 if (PrintVMOptions) {
3024 const char* tail;
3025 for (int i = 0; i < vm_args.nOptions; i++) {
3026 const JavaVMOption *option = vm_args.options + i;
3027 if (match_option(option, "-XX:", &tail)) {
3028 logOption(tail);
3029 }
3030 }
3031 }
3032
3033 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3034 }
3035 return JNI_OK;
3036 }
3037
3038 void Arguments::set_shared_spaces_flags() {
3039 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3040 const bool might_share = must_share || UseSharedSpaces;
3041
3042 // The string table is part of the shared archive so the size must match.
3043 if (!FLAG_IS_DEFAULT(StringTableSize)) {
3044 // Disable sharing.
3045 if (must_share) {
3046 warning("disabling shared archive %s because of non-default "
3047 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
3048 }
3049 if (might_share) {
3050 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
3051 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
3052 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3053 }
3054 return;
3055 }
3056
3057 // Check whether class data sharing settings conflict with GC, compressed oops
3058 // or page size, and fix them up. Explicit sharing options override other
3059 // settings.
3060 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
3061 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
3062 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
3063 if (cannot_share) {
3064 if (must_share) {
3065 warning("selecting serial gc and disabling large pages %s"
3066 "because of %s", "" LP64_ONLY("and compressed oops "),
3067 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3068 force_serial_gc();
3069 FLAG_SET_CMDLINE(bool, UseLargePages, false);
3070 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
3071 } else {
3072 if (UseSharedSpaces && Verbose) {
3073 warning("turning off use of shared archive because of "
3074 "choice of garbage collector or large pages");
3075 }
3076 no_shared_spaces();
3077 }
3078 } else if (UseLargePages && might_share) {
3079 // Disable large pages to allow shared spaces. This is sub-optimal, since
3080 // there may not even be a shared archive to use.
3081 FLAG_SET_DEFAULT(UseLargePages, false);
3082 }
3083 }
3084
3085 // Disable options not supported in this release, with a warning if they
3086 // were explicitly requested on the command-line
3087 #define UNSUPPORTED_OPTION(opt, description) \
3088 do { \
3089 if (opt) { \
3090 if (FLAG_IS_CMDLINE(opt)) { \
3091 warning(description " is disabled in this release."); \
3092 } \
3093 FLAG_SET_DEFAULT(opt, false); \
3094 } \
3095 } while(0)
3096
3097 // Parse entry point called from JNI_CreateJavaVM
3098
3099 jint Arguments::parse(const JavaVMInitArgs* args) {
3100
3101 // Sharing support
3102 // Construct the path to the archive
3103 char jvm_path[JVM_MAXPATHLEN];
3104 os::jvm_path(jvm_path, sizeof(jvm_path));
3105 char *end = strrchr(jvm_path, *os::file_separator());
3106 if (end != NULL) *end = '\0';
3107 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3108 strlen(os::file_separator()) + 20, mtInternal);
3109 if (shared_archive_path == NULL) return JNI_ENOMEM;
3110 strcpy(shared_archive_path, jvm_path);
3111 strcat(shared_archive_path, os::file_separator());
3112 strcat(shared_archive_path, "classes");
3113 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
3114 strcat(shared_archive_path, ".jsa");
3115 SharedArchivePath = shared_archive_path;
3116
3117 // Remaining part of option string
3118 const char* tail;
3119
3120 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3121 const char* hotspotrc = ".hotspotrc";
3122 bool settings_file_specified = false;
3123 bool needs_hotspotrc_warning = false;
3124
3125 const char* flags_file;
3126 int index;
3127 for (index = 0; index < args->nOptions; index++) {
3128 const JavaVMOption *option = args->options + index;
3129 if (match_option(option, "-XX:Flags=", &tail)) {
3130 flags_file = tail;
3131 settings_file_specified = true;
3132 }
3133 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3134 PrintVMOptions = true;
3135 }
3136 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3137 PrintVMOptions = false;
3138 }
3139 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3140 IgnoreUnrecognizedVMOptions = true;
3141 }
3142 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3143 IgnoreUnrecognizedVMOptions = false;
3144 }
3145 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3146 CommandLineFlags::printFlags(tty, false);
3147 vm_exit(0);
3148 }
3149 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3150 MemTracker::init_tracking_options(tail);
3151 }
3152
3153
3154 #ifndef PRODUCT
3155 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3156 CommandLineFlags::printFlags(tty, true);
3157 vm_exit(0);
3158 }
3159 #endif
3160 }
3161
3162 if (IgnoreUnrecognizedVMOptions) {
3163 // uncast const to modify the flag args->ignoreUnrecognized
3164 *(jboolean*)(&args->ignoreUnrecognized) = true;
3165 }
3166
3167 // Parse specified settings file
3168 if (settings_file_specified) {
3169 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3170 return JNI_EINVAL;
3171 }
3172 } else {
3173 #ifdef ASSERT
3174 // Parse default .hotspotrc settings file
3175 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3176 return JNI_EINVAL;
3177 }
3178 #else
3179 struct stat buf;
3180 if (os::stat(hotspotrc, &buf) == 0) {
3181 needs_hotspotrc_warning = true;
3182 }
3183 #endif
3184 }
3185
3186 if (PrintVMOptions) {
3187 for (index = 0; index < args->nOptions; index++) {
3188 const JavaVMOption *option = args->options + index;
3189 if (match_option(option, "-XX:", &tail)) {
3190 logOption(tail);
3191 }
3192 }
3193 }
3194
3195 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3196 jint result = parse_vm_init_args(args);
3197 if (result != JNI_OK) {
3198 return result;
3199 }
3200
3201 // Delay warning until here so that we've had a chance to process
3202 // the -XX:-PrintWarnings flag
3203 if (needs_hotspotrc_warning) {
3204 warning("%s file is present but has been ignored. "
3205 "Run with -XX:Flags=%s to load the file.",
3206 hotspotrc, hotspotrc);
3207 }
3208
3209 #if (defined JAVASE_EMBEDDED || defined ARM)
3210 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3211 #endif
3212
3213 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3214 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3215 #endif
3216
3217 #ifndef PRODUCT
3218 if (TraceBytecodesAt != 0) {
3219 TraceBytecodes = true;
3220 }
3221 if (CountCompiledCalls) {
3222 if (UseCounterDecay) {
3223 warning("UseCounterDecay disabled because CountCalls is set");
3224 UseCounterDecay = false;
3225 }
3226 }
3227 #endif // PRODUCT
3228
3229 // JSR 292 is not supported before 1.7
3230 if (!JDK_Version::is_gte_jdk17x_version()) {
3231 if (EnableInvokeDynamic) {
3232 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3233 warning("JSR 292 is not supported before 1.7. Disabling support.");
3234 }
3235 EnableInvokeDynamic = false;
3236 }
3237 }
3238
3239 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3240 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3241 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3242 }
3243 ScavengeRootsInCode = 1;
3244 }
3245 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3246 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3247 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3248 }
3249 ScavengeRootsInCode = 1;
3250 }
3251
3252 if (PrintGCDetails) {
3253 // Turn on -verbose:gc options as well
3254 PrintGC = true;
3255 }
3256
3257 if (!JDK_Version::is_gte_jdk18x_version()) {
3258 // To avoid changing the log format for 7 updates this flag is only
3259 // true by default in JDK8 and above.
3260 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3261 FLAG_SET_DEFAULT(PrintGCCause, false);
3262 }
3263 }
3264
3265 // Set object alignment values.
3266 set_object_alignment();
3267
3268 #ifdef SERIALGC
3269 force_serial_gc();
3270 #endif // SERIALGC
3271
3272 // Set flags based on ergonomics.
3273 set_ergonomics_flags();
3274
3275 set_shared_spaces_flags();
3276
3277 // Check the GC selections again.
3278 if (!check_gc_consistency()) {
3279 return JNI_EINVAL;
3280 }
3281
3282 if (TieredCompilation) {
3283 set_tiered_flags();
3284 } else {
3285 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3286 if (CompilationPolicyChoice >= 2) {
3287 vm_exit_during_initialization(
3288 "Incompatible compilation policy selected", NULL);
3289 }
3290 }
3291 set_heap_base_min_address();
3292 // Set heap size based on available physical memory
3293 set_heap_size();
3294 // Set per-collector flags
3295 if (UseParallelGC || UseParallelOldGC) {
3296 set_parallel_gc_flags();
3297 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3298 set_cms_and_parnew_gc_flags();
3299 } else if (UseParNewGC) { // skipped if CMS is set above
3300 set_parnew_gc_flags();
3301 } else if (UseG1GC) {
3302 set_g1_gc_flags();
3303 }
3304
3305 #ifdef SERIALGC
3306 assert(verify_serial_gc_flags(), "SerialGC unset");
3307 #endif // SERIALGC
3308
3309 // Set bytecode rewriting flags
3310 set_bytecode_flags();
3311
3312 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3313 set_aggressive_opts_flags();
3314
3315 // Turn off biased locking for locking debug mode flags,
3316 // which are subtlely different from each other but neither works with
3317 // biased locking.
3318 if (UseHeavyMonitors
3319 #ifdef COMPILER1
3320 || !UseFastLocking
3321 #endif // COMPILER1
3322 ) {
3323 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3324 // flag set to true on command line; warn the user that they
3325 // can't enable biased locking here
3326 warning("Biased Locking is not supported with locking debug flags"
3327 "; ignoring UseBiasedLocking flag." );
3328 }
3329 UseBiasedLocking = false;
3330 }
3331
3332 #ifdef CC_INTERP
3333 // Clear flags not supported by the C++ interpreter
3334 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3335 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3336 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3337 #endif // CC_INTERP
3338
3339 #ifdef COMPILER2
3340 if (!EliminateLocks) {
3341 EliminateNestedLocks = false;
3342 }
3343 if (!Inline) {
3344 IncrementalInline = false;
3345 }
3346 #ifndef PRODUCT
3347 if (!IncrementalInline) {
3348 AlwaysIncrementalInline = false;
3349 }
3350 #endif
3351 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3352 // incremental inlining: bump MaxNodeLimit
3353 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3354 }
3355 #endif
3356
3357 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3358 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3359 DebugNonSafepoints = true;
3360 }
3361
3362 #ifndef PRODUCT
3363 if (CompileTheWorld) {
3364 // Force NmethodSweeper to sweep whole CodeCache each time.
3365 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3366 NmethodSweepFraction = 1;
3367 }
3368 }
3369 #endif
3370
3371 if (PrintCommandLineFlags) {
3372 CommandLineFlags::printSetFlags(tty);
3373 }
3374
3375 // Apply CPU specific policy for the BiasedLocking
3376 if (UseBiasedLocking) {
3377 if (!VM_Version::use_biased_locking() &&
3378 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3379 UseBiasedLocking = false;
3380 }
3381 }
3382
3383 #ifdef COMPILER2
3384 if (!UseBiasedLocking || EmitSync != 0) {
3385 UseOptoBiasInlining = false;
3386 }
3387 #endif
3388
3389 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3390 // but only if not already set on the commandline
3391 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3392 bool set = false;
3393 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3394 if (!set) {
3395 FLAG_SET_DEFAULT(PauseAtExit, true);
3396 }
3397 }
3398
3399 return JNI_OK;
3400 }
3401
3402 int Arguments::PropertyList_count(SystemProperty* pl) {
3403 int count = 0;
3404 while(pl != NULL) {
3405 count++;
3406 pl = pl->next();
3407 }
3408 return count;
3409 }
3410
3411 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3412 assert(key != NULL, "just checking");
3413 SystemProperty* prop;
3414 for (prop = pl; prop != NULL; prop = prop->next()) {
3415 if (strcmp(key, prop->key()) == 0) return prop->value();
3416 }
3417 return NULL;
3418 }
3419
3420 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3421 int count = 0;
3422 const char* ret_val = NULL;
3423
3424 while(pl != NULL) {
3425 if(count >= index) {
3426 ret_val = pl->key();
3427 break;
3428 }
3429 count++;
3430 pl = pl->next();
3431 }
3432
3433 return ret_val;
3434 }
3435
3436 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3437 int count = 0;
3438 char* ret_val = NULL;
3439
3440 while(pl != NULL) {
3441 if(count >= index) {
3442 ret_val = pl->value();
3443 break;
3444 }
3445 count++;
3446 pl = pl->next();
3447 }
3448
3449 return ret_val;
3450 }
3451
3452 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3453 SystemProperty* p = *plist;
3454 if (p == NULL) {
3455 *plist = new_p;
3456 } else {
3457 while (p->next() != NULL) {
3458 p = p->next();
3459 }
3460 p->set_next(new_p);
3461 }
3462 }
3463
3464 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3465 if (plist == NULL)
3466 return;
3467
3468 SystemProperty* new_p = new SystemProperty(k, v, true);
3469 PropertyList_add(plist, new_p);
3470 }
3471
3472 // This add maintains unique property key in the list.
3473 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3474 if (plist == NULL)
3475 return;
3476
3477 // If property key exist then update with new value.
3478 SystemProperty* prop;
3479 for (prop = *plist; prop != NULL; prop = prop->next()) {
3480 if (strcmp(k, prop->key()) == 0) {
3481 if (append) {
3482 prop->append_value(v);
3483 } else {
3484 prop->set_value(v);
3485 }
3486 return;
3487 }
3488 }
3489
3490 PropertyList_add(plist, k, v);
3491 }
3492
3493 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3494 // Returns true if all of the source pointed by src has been copied over to
3495 // the destination buffer pointed by buf. Otherwise, returns false.
3496 // Notes:
3497 // 1. If the length (buflen) of the destination buffer excluding the
3498 // NULL terminator character is not long enough for holding the expanded
3499 // pid characters, it also returns false instead of returning the partially
3500 // expanded one.
3501 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3502 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3503 char* buf, size_t buflen) {
3504 const char* p = src;
3505 char* b = buf;
3506 const char* src_end = &src[srclen];
3507 char* buf_end = &buf[buflen - 1];
3508
3509 while (p < src_end && b < buf_end) {
3510 if (*p == '%') {
3511 switch (*(++p)) {
3512 case '%': // "%%" ==> "%"
3513 *b++ = *p++;
3514 break;
3515 case 'p': { // "%p" ==> current process id
3516 // buf_end points to the character before the last character so
3517 // that we could write '\0' to the end of the buffer.
3518 size_t buf_sz = buf_end - b + 1;
3519 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3520
3521 // if jio_snprintf fails or the buffer is not long enough to hold
3522 // the expanded pid, returns false.
3523 if (ret < 0 || ret >= (int)buf_sz) {
3524 return false;
3525 } else {
3526 b += ret;
3527 assert(*b == '\0', "fail in copy_expand_pid");
3528 if (p == src_end && b == buf_end + 1) {
3529 // reach the end of the buffer.
3530 return true;
3531 }
3532 }
3533 p++;
3534 break;
3535 }
3536 default :
3537 *b++ = '%';
3538 }
3539 } else {
3540 *b++ = *p++;
3541 }
3542 }
3543 *b = '\0';
3544 return (p == src_end); // return false if not all of the source was copied
3545 }